COMPUTER Computer Is an Electronic Device That Is Designed To

COMPUTER Computer is an electronic device that is designed to work with Information.The term <a href="/goto?url=http://ecomputernotes.com/fundamental/introduction-to-computer/what-is-computer" target="_blank">computer </a>is derived from the Latin term „computare‟, this means to calculate.Computer can not do anything without a Program.it represents the decimal numbers through a string of binary digits. The Word 'Computer'usually refers to the <a href="/goto?url=http://ecomputernotes.com/fundamental/introduction-to-computer/what-is-cpu" target="_blank">Center Processor </a>Unit plus Internal <a href="/goto?url=http://ecomputernotes.com/fundamental/input-output-and-memory/what-are-the-different-types-of-ram-explain-in-detail" target="_blank">memory. </a>Computer is an advanced electronic device that takes raw data as input from the user and processes these data under the control of set of instructions (called program) and gives the result (output) and saves output for the future use. It can process both numerical and non-numerical (arithmetic and logical) calculations.The basic components of a modern digital computer are: <a href="/goto?url=http://ecomputernotes.com/fundamental/input-output-and-memory/list-various-input-and-output-devices" target="_blank">Input Device,Output Device,</a>Central Processor. A Typical modern computer uses LSI Chips. Charles Babbage is called the "Grand Father" of the computer.The First mechanical computer designed by charles Babbage was called Analytical Engine. It uses read-only memory in the form of punch cards. Four Functions about computer are: <ul style="display: flex;"><li style="flex:1">accepts data </li><li style="flex:1">Input </li></ul><ul style="display: flex;"><li style="flex:1">processes data </li><li style="flex:1">Processing </li></ul>produces output stores results Output Storage Input (Data): Input is the raw information entered into a computer from the input devices. It is the collection of letters, numbers, images etc. Process: Process is the operation of data as per given instruction. It is totally internal process of the computer system. Output: Output is the processed data given by computer after data processing. Output is also called as Result. We can save these results in the <a href="/goto?url=http://ecomputernotes.com/fundamental/input-output-and-memory/explain-secondary-storage-devices" target="_blank">storage </a><a href="/goto?url=http://ecomputernotes.com/fundamental/input-output-and-memory/explain-secondary-storage-devices" target="_blank">devices </a>for the future use. Modern computers based on <a href="/goto?url=http://en.wikipedia.org/wiki/Integrated_circuit" target="_blank">integrated circuits </a>are millions to billions of times more capable than the early machines, and occupy a fraction of the space<a href="/goto?url=http://en.wikipedia.org/wiki/Computer#cite_note-2" target="_blank">.</a>[2] Simple computers are small enough to fit int<a href="/goto?url=http://en.wikipedia.org/wiki/Mobile_device" target="_blank">o mobile devices, </a>and <a href="/goto?url=http://en.wikipedia.org/wiki/Mobile_computing" target="_blank">mobile computers </a>can be powered by small <a href="/goto?url=http://en.wikipedia.org/wiki/Battery_%28electricity%29" target="_blank">batteries. </a>Personal computers in their various forms are <a href="/goto?url=http://en.wikipedia.org/wiki/Icon" target="_blank">icons </a>of the <a href="/goto?url=http://en.wikipedia.org/wiki/Information_Age" target="_blank">Information Age </a>and are what most people think of as “computers.” However, the <a href="/goto?url=http://en.wikipedia.org/wiki/Embedded_system" target="_blank">embedded computers </a>found in many devices from <a href="/goto?url=http://en.wikipedia.org/wiki/Digital_audio_player" target="_blank">MP3 players </a>to <a href="/goto?url=http://en.wikipedia.org/wiki/Fighter_aircraft" target="_blank">fighter aircraft </a>and from toys to <a href="/goto?url=http://en.wikipedia.org/wiki/Industrial_robot" target="_blank">industrial robots </a>are the most numerous. What components make a computer? Today's computers are often comprised with some or all of the below components <a href="/goto?url=http://www.computerhope.com/jargon/h/hardware.htm" target="_blank">(hardware)</a>. As technology advances, older technologies such as the floppy disk drive and Zip drive (both shown below) are no longer required or included with computers. Bay  <a href="/goto?url=http://www.computerhope.com/jargon/c/chassis.htm" target="_blank">Case or Chassis </a> Optical drive: <a href="/goto?url=http://www.computerhope.com/jargon/b/bd.htm" target="_blank">Blu-ray, </a><a href="/goto?url=http://www.computerhope.com/jargon/c/cdrom.htm" target="_blank">CD-ROM, </a><a href="/goto?url=http://www.computerhope.com/jargon/c/cdr.htm" target="_blank">CD-R, </a><a href="/goto?url=http://www.computerhope.com/jargon/r/rw.htm" target="_blank">CD-RW, </a><a href="/goto?url=http://www.computerhope.com/jargon/d/dvd.htm" target="_blank">or DVD </a> <a href="/goto?url=http://www.computerhope.com/jargon/c/cpu.htm" target="_blank">CPU </a>(processor)  <a href="/goto?url=http://www.computerhope.com/jargon/f/fdd.htm" target="_blank">Floppy disk drive </a> <a href="/goto?url=http://www.computerhope.com/jargon/h/harddriv.htm" target="_blank">Hard drive </a> <a href="/goto?url=http://www.computerhope.com/jargon/k/keyboard.htm" target="_blank">Keyboard </a> <a href="/goto?url=http://www.computerhope.com/jargon/m/memory.htm" target="_blank">Memory </a><a href="/goto?url=http://www.computerhope.com/jargon/r/ram.htm" target="_blank">(RAM) </a> <a href="/goto?url=http://www.computerhope.com/jargon/m/micrphon.htm" target="_blank">Microphone </a> <a href="/goto?url=http://www.computerhope.com/jargon/m/monitor.htm" target="_blank">Monitor, </a><a href="/goto?url=http://www.computerhope.com/jargon/l/lcd.htm" target="_blank">LCD, </a>or other display device  <a href="/goto?url=http://www.computerhope.com/jargon/m/mothboar.htm" target="_blank">Motherboard </a> <a href="/goto?url=http://www.computerhope.com/jargon/m/mouse.htm" target="_blank">Mouse </a> <a href="/goto?url=http://www.computerhope.com/jargon/p/printer.htm" target="_blank">Printer </a> <a href="/goto?url=http://www.computerhope.com/jargon/s/souncard.htm" target="_blank">Sound card </a> <a href="/goto?url=http://www.computerhope.com/jargon/s/speaker.htm" target="_blank">Speakers </a> <a href="/goto?url=http://www.computerhope.com/help/video.htm" target="_blank">Video card </a>Inside of the computer  <a href="/goto?url=http://www.computerhope.com/issues/ch000997.htm" target="_blank">What does the inside of a computer look like? </a>Connections A diagram of the back of a personal computer and a brief description of the computer connections can also be found on <a href="/goto?url=http://www.computerhope.com/jargon/c/connect.htm" target="_blank">our connection </a>definition. Peripherals A peripheral is any accessory or add-on that can be attached to your computer, but is not required. For example, a computer printer is a perfect example of a peripheral. See the <a href="/goto?url=http://www.computerhope.com/jargon/p/peripher.htm" target="_blank">peripheral </a>definition for a full list of peripherals that can be attached to your computer. Variations of computers When talking about a computer or a "PC" you are usually referring to a traditional computer that you would find in a home or office. However, today the lines of what makes a computer are blurring. Below, are all the different examples of what is considered a computer today.  <a href="/goto?url=http://www.computerhope.com/jargon/e/embedded.htm" target="_blank">Embedded computers </a>- The most commonly found and used computer. An embedded computer is a computer with a specific function found in such things as cars, microwaves, TVs, the VCR, and other home electronics. LAPTOP A laptop computer, sometimes called a notebook computer by manufacturers, is a battery- or AC-powered personal computer generally smaller than a briefcase that can easily be transported and conveniently used in temporary spaces such as on airplanes, in libraries, temporary offices, and at meetings. A laptop typically weighs less than 5 pounds and is 3 inches or less in thickness. Among the best-known makers of laptop computers are IBM, Apple, Compaq, Dell, and Toshiba. Laptop computers generally cost more than desktop computers with the same capabilities because they are more difficult to design and manufacture. A laptop can effectively be turned into a desktop computer with a <a href="/goto?url=http://whatis.techtarget.com/definition/docking-station" target="_blank">docking station, </a>a hardware frame that supplies connections for peripheral input/output devices such as a printer or larger monitor. The less capable <a href="/goto?url=http://whatis.techtarget.com/definition/port-replicator" target="_blank">port replicator </a>allows you to connect a laptop to a number of peripherals through a single plug. Laptops usually come with displays that use thin-screen technology. The thin film transistor or active matrix screen is brighter and views better at different angles than the STN or dual-scan screen. Laptops use several different approaches for integrating a <a href="/goto?url=http://searchexchange.techtarget.com/definition/mouse" target="_blank">mouse </a>into the keyboard, including the <a href="/goto?url=http://searchmobilecomputing.techtarget.com/definition/touch-pad" target="_blank">touch pad, </a>the <a href="/goto?url=http://whatis.techtarget.com/definition/trackball" target="_blank">trackball, </a>and the pointing stick. A serial port also allows a regular mouse to be attached. The <a href="/goto?url=http://searchcio-midmarket.techtarget.com/definition/PC-Card" target="_blank">PC Card </a>is insertable hardware for adding <a href="/goto?url=http://searchmobilecomputing.techtarget.com/definition/modem" target="_blank">a modem </a>or <a href="/goto?url=http://searchnetworking.techtarget.com/definition/network-interface-card" target="_blank">network interface card </a>to a laptop. <a href="/goto?url=http://searchcio-midmarket.techtarget.com/definition/CD-ROM" target="_blank">CD-ROM </a>and digital versatile disc drives may be built-in or attachable. Laptop computers, also known as notebooks, are portable computers that you can take with you and use in different environments. They include a screen, keyboard, and a trackpad or trackball, which serves as the <a href="/goto?url=http://www.techterms.com/definition/mouse" target="_blank">mouse. </a>Because laptops are meant to be used on the go, they have a battery which allows them to operate without being plugged into a power outlet. Laptops also include a power adapter that allows them to use power from an outlet and recharges the battery. While portable computers used to be significantly slower and less capable than desktop computers, advances in manufacturing technology have enabled laptops to perform nearly as well as their desktop counterparts. In fact, high-end laptops often perform better than low or even mid-range desktop systems. Most laptops also include several <a href="/goto?url=http://www.techterms.com/definition/io" target="_blank">I/O </a>ports, such as <a href="/goto?url=http://www.techterms.com/definition/usb" target="_blank">USB </a>ports, that allow standard keyboards and mice to be used with the laptop. Modern laptops often include a wireless networking adapter as well, allowing users to access the Internet without requiring any wires. While laptops can be powerful and convenient, the convenience often comes at a price. Most laptops cost several hundred dollars more than a similarly equipped desktop model with a monitor, keyboard, and mouse. Furthermore, working long hours on a laptop with a small screen and keyboard may be more fatiguing than working on a desktop system. Therefore, if portability is not a requirement for your computer, you may find better value in a desktop model. MOBILE A mobile phone is a wireless handheld device that allows users to make calls and send text messages, among other features. The earliest batch of mobile phones could only make and receive calls. Today‟s mobile phones, however, are packed with a lot of additional features such as Web browsers, games, cameras, video players and even navigational systems. A mobile phone may also be known as a cellular phone or simply cellphone. When the first mobile phones were introduced, all they could do was make calls, and they were so bulky it was impossible to carry them in a pocket. Later on, mobile phones belonging to the Global System for Mobile Communications (GSM) network were capable of sending and receiving text messages. As these devices evolved, they became smaller and more and more features were added, such as multimedia messaging service (MMS), which allowed users to send and receive images. Most of these MMS-capable devices were naturally equipped with cameras, which allowed users to capture photos with the built-in camera, add captions, and send them to friends and relatives who also had MMS- capable phones. A mobile phone with highly advanced features is called a smartphone, while a regular mobile phone is known as a feature phone. A mobile phone typically operates on a cellular network, which is composed of cell sites scattered throughout cities, countrysides, and even mountainous regions. If a user happens to be located in an area where there is no signal from any cell site belonging to the cellular network provider he or she is subscribed to, calls will not be able to placed or received in that location. Portable <a href="/goto?url=http://www.businessdictionary.com/definition/telephone.html" target="_blank">telephone </a>device that does not require the use of landlines. Mobile phones util<a href="/goto?url=http://www.businessdictionary.com/definition/frequency.html" target="_blank">ize frequencies </a>transmitted by cellular towers to connect the calls between t<a href="/goto?url=http://www.businessdictionary.com/definition/device.html" target="_blank">wo devices. </a>The first mobile phone <a href="/goto?url=http://www.businessdictionary.com/definition/operate.html" target="_blank">operated </a>on <a href="/goto?url=http://www.businessdictionary.com/definition/analog.html" target="_blank">an analog </a><a href="/goto?url=http://www.businessdictionary.com/definition/final-good-service.html" target="_blank">service </a>and was <a href="/goto?url=http://www.businessdictionary.com/definition/developed.html" target="_blank">developed </a>by Motorola, Inc. Mobile phones have grown to be the most widely used portable device in the world. Mobile phones may also be referred to as wireless or cellular phones. A mobile phone is a wireless electronic device used for telephone and multimedia communications. The term "mobile phone" does not typically refer to <a href="/goto?url=http://www.wisegeek.com/what-is-a-cordless-phone.htm" target="_blank">a cordless phone, </a>which is ultimately still connected to a land line. Mobile phones are just another word for cell phones, and they receive their service from cell phone towers. A mobile phone may be used anywhere outdoors or indoors, and does not have a base unit that it must be returned to like a cordless phone. Mobile phones may be purchased directly from the manufacturers, or they may be purchased as part of a cell phone service contract from a <a href="/goto?url=http://www.wisegeek.com/what-is-a-service-provider.htm" target="_blank">service </a><a href="/goto?url=http://www.wisegeek.com/what-is-a-service-provider.htm" target="_blank">provider. </a>It is often more expensive to purchase a mobile phone from the manufacturer, because service providers often offer steep discounts when purchasing a phone with a one- or two-year contract. There are different types of mobile phones to suit different needs. A basic mobile phone is simply able to make and receive calls, and send and receive text messages. In addition, it may have other basic features such as games, a calendar, or a camera, among others. A <a href="/goto?url=http://www.wisegeek.com/what-is-a-smartphone.htm" target="_blank">smartphone, </a>on the other hand, is a mobile phone that is capable of accessing and browsing the Internet; it may also include computer programs for word processing or spreadsheets, for example. Smartphones are convenient for those who need to frequently check <a href="/goto?url=http://www.wisegeek.com/what-is-email.htm" target="_blank">email </a>or access documents. Most smartphones also feature full-size keyboards, whereas a basic cell phone might feature a condensed keyboard. IPAD After months of hype and speculation, Apple introduced its latest creation, the iPad, at an event in San Francisco earlier this year. The mobile computing device, which has been described by some as a cross between the iPhone and a MacBook laptop, hit the store shelves and Apple has since sold 1 million of them. But what is it really, and what does it do? Here are 18 things to know about the iPad. iPad is a line <a href="/goto?url=http://en.wikipedia.org/wiki/Tablet_computer" target="_blank">of tablet computers </a>designed and marketed by <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_Inc." target="_blank">Apple Inc., </a>which runs Apple's <a href="/goto?url=http://en.wikipedia.org/wiki/IOS" target="_blank">iOS. </a>The first iPad was released on April 3, 2010; the most recent iPad models, the <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_Air" target="_blank">iPad Air </a><a href="/goto?url=http://en.wikipedia.org/wiki/IPad_Mini_(second_generation)" target="_blank">and second generation iPad Mini, </a>were revealed on October 22, 2013 and went on sale November 1, 2013, and November 12, 2013, respectively. The <a href="/goto?url=http://en.wikipedia.org/wiki/User_interface" target="_blank">user interface </a>is built around the device's <a href="/goto?url=http://en.wikipedia.org/wiki/Multi-touch" target="_blank">multi-touch </a>screen, including <a href="/goto?url=http://en.wikipedia.org/wiki/Virtual_keyboard" target="_blank">a virtual keyboard. </a>The iPad has built-in <a href="/goto?url=http://en.wikipedia.org/wiki/Wi-Fi" target="_blank">Wi-Fi </a>and, on some models, cellular connectivity. As of June, 2014, there have been over 200 million iPads sold since its release in 2<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-number_sold-5" target="_blank">010.</a>[5] An iPad c<a href="/goto?url=http://en.wikipedia.org/wiki/Video_camera" target="_blank">an shoot video, </a><a href="/goto?url=http://en.wikipedia.org/wiki/Camera_phone" target="_blank">take photos, </a><a href="/goto?url=http://en.wikipedia.org/wiki/Portable_media_player" target="_blank">play music, </a>and perform Internet functions such as web-browsing and emailing. Other functions<a href="/goto?url=http://en.wikipedia.org/wiki/Video_game" target="_blank">—</a><a href="/goto?url=http://en.wikipedia.org/wiki/Video_game" target="_blank">games, </a><a href="/goto?url=http://en.wikipedia.org/wiki/Reference_work" target="_blank">reference, </a><a href="/goto?url=http://en.wikipedia.org/wiki/GPS_navigation_software" target="_blank">GPS navigation, </a><a href="/goto?url=http://en.wikipedia.org/wiki/Social_networking_service" target="_blank">social networking, </a>etc.—can be enabled by downloading and installing <a href="/goto?url=http://en.wikipedia.org/wiki/Application_software" target="_blank">apps. </a>As of October 2013, the <a href="/goto?url=http://en.wikipedia.org/wiki/App_Store_(iOS)" target="_blank">App Store </a>has more than 475,000 native apps by Apple and third parties. There have been five <a href="/goto?url=http://en.wikipedia.org/wiki/List_of_iOS_devices#iPad" target="_blank">versions </a>of the iPad. The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_(first_generation)" target="_blank">first generation </a>established design precedents, such as the 9.7-inch screen size and button placement, that have persisted through all models. The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_2" target="_blank">iPad 2 </a>added <a href="/goto?url=http://en.wikipedia.org/wiki/Dual_core" target="_blank">a dual core </a><a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A5" target="_blank">Apple </a><a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A5" target="_blank">A5 </a>processor and VGA front-facing an<a href="/goto?url=http://en.wikipedia.org/wiki/720p" target="_blank">d 720p </a>rear-facing cameras designed for <a href="/goto?url=http://en.wikipedia.org/wiki/FaceTime" target="_blank">FaceTime </a>video calling. The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_(third_generation)" target="_blank">third generation </a>added a <a href="/goto?url=http://en.wikipedia.org/wiki/Retina_Display" target="_blank">Retina Display, </a>the new <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A5X" target="_blank">Apple A5X </a>processor with a <a href="/goto?url=http://en.wikipedia.org/wiki/Multi-core_processor" target="_blank">quad-core </a><a href="/goto?url=http://en.wikipedia.org/wiki/Graphics_processing_unit" target="_blank">graphics processor, </a>a 5- <a href="/goto?url=http://en.wikipedia.org/wiki/Megapixel" target="_blank">megapixel </a>camera, HD <a href="/goto?url=http://en.wikipedia.org/wiki/1080p" target="_blank">1080p </a>video recording, <a href="/goto?url=http://en.wikipedia.org/wiki/Digital_dictation" target="_blank">voice dictation, </a>and <a href="/goto?url=http://en.wikipedia.org/wiki/4G" target="_blank">4G </a><a href="/goto?url=http://en.wikipedia.org/wiki/3GPP_Long_Term_Evolution" target="_blank">(LTE). </a>The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_(fourth_generation)" target="_blank">fourth generation </a>added the <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A6X" target="_blank">Apple A6X </a>processor and replaces the <a href="/goto?url=http://en.wikipedia.org/wiki/30-pin_dock_connector#Apple_30-pin_dock_connector" target="_blank">30-pin connector </a>with an all-digital <a href="/goto?url=http://en.wikipedia.org/wiki/Lightning_(connector)" target="_blank">Lightning connector. </a>The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_Air" target="_blank">iPad Air </a>added the <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A7" target="_blank">Apple A7 </a>processor, the <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_M7" target="_blank">Apple M7 </a>motion coprocessor and reduced the form factor for the first time since the iPad 2. iOS 6.0 added <a href="/goto?url=http://en.wikipedia.org/wiki/Siri" target="_blank">Siri </a>to the third and fourth generations and the iPad Mini. There have been tw<a href="/goto?url=http://en.wikipedia.org/wiki/List_of_iOS_devices#iPad_Mini" target="_blank">o versions </a>of the <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_Mini" target="_blank">iPad Mini. </a>The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_Mini_(first_generation)" target="_blank">first generation </a>features a reduced screen size of 7.9 inches and features similar internal specifications as the iPad 2 except it uses the Lightning connector. The <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_Mini_(second_generation)" target="_blank">second generation </a>features the <a href="/goto?url=http://en.wikipedia.org/wiki/Retina_Display" target="_blank">Retina Display, </a>the <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A7" target="_blank">Apple A7 </a>processor and the <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_M7" target="_blank">Apple M7 </a>motion coprocessor, closely matching the internals specifications of the iPad Air. In the last quarter of 2013, there were 26 million iPads sold, a new record, compared to 22.9 million in the last quarter of 2012 Apple's first tablet computer was the <a href="/goto?url=http://en.wikipedia.org/wiki/Newton_(platform)" target="_blank">Newton </a><a href="/goto?url=http://en.wikipedia.org/wiki/MessagePad" target="_blank">MessagePad 100,</a>[17][18] introduced in 1993, which led to the creation of the <a href="/goto?url=http://en.wikipedia.org/wiki/ARM_architecture" target="_blank">ARM6 </a>processor core wit<a href="/goto?url=http://en.wikipedia.org/wiki/Acorn_Computers" target="_blank">h Acorn Computers. </a>Apple also developed a prototype <a href="/goto?url=http://en.wikipedia.org/wiki/PowerBook_Duo" target="_blank">PowerBook Duo- </a>based tablet, the <a href="/goto?url=http://en.wikipedia.org/wiki/PowerBook_Duo#PenLite" target="_blank">PenLite, </a>but decided not to sell it in order to avoid hurting MessagePad sales<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-PenLite_Development-19" target="_blank">.</a>[19] Apple released several more Newton-based PDAs; the final one, the <a href="/goto?url=http://en.wikipedia.org/wiki/MessagePad" target="_blank">MessagePad 2100, </a>was discontinued in 1998. Apple re-entered the mobile-computing markets in 2007 with the <a href="/goto?url=http://en.wikipedia.org/wiki/IPhone" target="_blank">iPhone. </a>Smaller than the iPad, but featuring a camera and mobile phone, it pioneered the <a href="/goto?url=http://en.wikipedia.org/wiki/Multi-touch" target="_blank">multi-touch </a>finger-sensitive touchscreen interface of Apple's iOS mobile operating system. By late 2009, the iPad's release had been rumored for several years. Such speculation mostly talked about "Apple's tablet"; specific names included iTablet and iSlate<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-engagetrumor-20" target="_blank">.</a>[20] The iPad was announced on January 27, 2010, by Jobs at an Apple press conference at the <a href="/goto?url=http://en.wikipedia.org/wiki/Yerba_Buena_Center_for_the_Arts" target="_blank">Yerba Buena Center for the Arts </a>in San Francis<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Apple_PR-Jan-21" target="_blank">co.</a>[21][22] He later said that Apple had begun developing the iPad before the <a href="/goto?url=http://en.wikipedia.org/wiki/IPhone" target="_blank">iPhone,</a>[23][24] but had temporarily shelved the effort upon realizing that its ideas would work just as well in a mobile phone<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-25" target="_blank">.</a>[25] The iPad's internal codename was K48, which was revealed in the court case surrounding leaking of iPad information before launch<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-26" target="_blank">.</a>[26] Apple began taking pre-orders for the <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_(first_generation)" target="_blank">first-generation </a>iPad from American customers on March 12, 2<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Apple_PR_2-3" target="_blank">010.</a>[3] The only major change to the device between its announcement and being available to pre-order was the change of the behavior of the side switch to perform either sound muting or screen rotation locking (user selectable<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-27" target="_blank">).</a>[27] The Wi-Fi version of the iPad went on sale in the United States on April 3, 20<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Apple_PR_2-3" target="_blank">10.</a>[3][28] The Wi-Fi + 3G version was released on April 3<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Apple_PR_2-3" target="_blank">0.</a>[3][4][4] 3G service in the United States is provided by <a href="/goto?url=http://en.wikipedia.org/wiki/AT%26T_Mobility" target="_blank">AT&T </a>and was initially sold with two prepaid contract-free data plan options: one for unlimited data and the other for 250 MB per month at half the price<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-29" target="_blank">.</a>[29][30] On June 2, 2010, AT&T announced that effective June 7 the unlimited plan would be replaced for new customers with a 2 GB plan at slightly lower cost; existing customers would have the option to keep the unlimited plan<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-31" target="_blank">.</a>[31] The plans are activated on the iPad itself and can be canceled at any time<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-32" target="_blank">.</a>[32] The iPad was initially only available online at the Apple Store as well as the <a href="/goto?url=http://en.wikipedia.org/wiki/Apple_Store" target="_blank">company's retail locations, </a>but has since become available for purchase through retailers including Amazon, Walmart, and network operators. The iPad was launched in countries including Australia, Canada, France, Germany, Japan and the United Kingdom on May 2<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-FT-launch-33" target="_blank">8.</a>[33][34] Online preorders in those countries began on May 10<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Apple_PR_3-4" target="_blank">.</a>[4] Apple released the iPad in Hong Kong, Ireland, Mexico, New Zealand and Singapore on July 23, 2<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-35" target="_blank">010.</a>[35][36][37] Israel briefly prohibited importation of the iPad because of concerns that its Wi-Fi might interfere with other <a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-38" target="_blank">devices.</a>[38] On September 17, 2010, the iPad was officially launched in Chi<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-39" target="_blank">na.</a>[39] 300,000 iPads were sold on their first day of availability<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-40" target="_blank">.</a>[40] By May 3, 2010, Apple had sold a million iPads<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Jim_Goldman-41" target="_blank">,</a>[41] this was in half the time it took Apple to sell the same number of first generation iPhones<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-42" target="_blank">.</a>[42] After passing the one million mark they continued selling rapidly reaching 3 million sales after 80 days<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Apple_3_million-43" target="_blank">.</a>[43] During the October 18, 2010, Financial Conference Call, Steve Jobs announced that Apple had sold more iPads than Macs for the fiscal quarte<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-4Q-2010-results-44" target="_blank">r.</a>[44] In total, Apple sold more than 15 million first-generation iPads prior to the launch of the iPad 2<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-Announce_iPad_2-45" target="_blank">.</a>[45] — selling more than all other tablet PCs combined since the iPad's release<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-46" target="_blank">.</a>[46] and reaching 75% of tablet PC sales at the end of 2<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-47" target="_blank">010.</a>[47] Jobs unveiled the <a href="/goto?url=http://en.wikipedia.org/wiki/IPad_2" target="_blank">iPad 2 </a>at a March 2, 2011, press conference<a href="/goto?url=http://en.wikipedia.org/wiki/IPad#cite_note-48" target="_blank">.</a>[48][49] About 33% thinner than its predecessor and 15% lighter, the iPad 2 has a better processor, a <a href="/goto?url=http://en.wikipedia.org/wiki/Dual_core" target="_blank">dual core </a><a href="/goto?url=http://en.wikipedia.org/wiki/Apple_A5" target="_blank">Apple A5 </a>that Apple says is twice as fast as its predecessor for CPU operations and up to nine times as fast for GPU operations. The iPad 2 includes front and back cameras that support the <a href="/goto?url=http://en.wikipedia.org/wiki/FaceTime" target="_blank">FaceTime </a><a href="/goto?url=http://en.wikipedia.org/wiki/Videophone" target="_blank">videophone </a>application, as well as a three-axis <a href="/goto?url=http://en.wikipedia.org/wiki/Gyroscope" target="_blank">gyroscope. </a>It retained the original's 10-hour battery life and had a similar pricing scheme.

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