 System Testing (ST) is a black box testing technique performed to evaluate the complete system the system's compliance against specified requirements. In System testing, the functionalities of the system are tested from an end-to-end perspective.  System Testing is usually carried out by a team that is independent of the development team in order to measure the quality of the system unbiased. It includes both functional and Non- Functional testing.

 Acceptance testing is done to verify if the product meets customer requirement. System testing includes functional & non- functional testing and is performed by the testers. ... Testing is performed using test data created by the testers. Real/Production data is used while performing acceptance testing.  System Testing enables you to test, validate and verify both the Application Architecture and Business requirements. ... Generally, a separate and dedicated team is responsible for system testing. And, System Testing is performed on staging server which is similar to production server. ➢ For example, take an Gmail application : Suppose the test case is to check sending mail feature so as of system testing the steps will be as follows: Compose a mail Enter Repentance mail id Click on send button Validate if mail is sent msg is displayed Validate mail in out box Validate mail In Sent mail box Now Notice the all the above steps are in relation to only a single system it do not includes validating received mail on the other mail box(external system ) Such type of test will be referred to as System testing.  Debugging is the process of finding and resolving defects or problems within a computer program that prevent correct operation of computer software or a system.  Debugging tactics can involve interactive debugging, control flow analysis, unit testing, integration testing, log file analysis, monitoring at the application or system level, memory dumps, and profiling.  In software development, debugging involves locating and correcting code errors in a computer program. ... In a large program that has thousands and thousands of lines of code, the debugging process can be made easier by using strategies such as unit tests, code reviews and pair programming.  A debugger is a computer program used by programmers to test and debug a target program. Debuggers may use instruction-set simulators, rather than running a program directly on the processor to achieve a higher level of control over its execution.  The commonly- used debugging strategies are debugging by brute force, induction strategy, deduction strategy, backtracking strategy, and debugging by testing. Brute force method of debugging is the most commonly used but least efficient method. ▪ Debugging is different from testing. Testing focuses on finding bugs, errors, etc whereas debugging starts after a bug has been identified in the software. Testing is used to ensure that the program is correct and it was supposed to do with a certain minimum success rate. Testing can be manual or automated. There are several different types of testing like unit testing, integration testing, alpha and beta testing, etc. ▪ Debugging requires a lot of knowledge, skills, and expertise. It can be supported by some automated tools available but is more of a manual process as every bug is different and requires a different technique, unlike a pre- defined testing mechanism.