In typography, a font (also fount) is traditionally defined as a quantity of sorts composing a complete character set of a single size and style of a particular typeface. For example, the set of all characters for 9-point Bulmer italic is a font, and the 10-point size would be a separate font, as would the 9-point upright.
After the introduction of computer fonts based on fully scalable outlines, a broader definition evolved. Font is no longer size-specific, but still refers to a single style. Bulmer regular, Bulmer italic, Bulmer bold and Bulmer bold italic are four fonts, but one typeface.
However, the term font is also often used as a synonym for typeface.
Font type
It is the apperance and shape of the letters, numbers and specific characters
Arial Times New Roman Bauhaus
Style
The stylistic attributes of a font, such as bold, italic, and underline.
Size
In typography, a point is the smallest unit of measure, being a subdivision of the larger pica. It is commonly abbreviated as pt. The traditional printer's point, from the era of hot metal typesetting and presswork, varied between 0.18 and 0.4 mm depending on various definitions of the foot.
Font sizes are measured and described in points, with each point equal to 1/72 of an inch. This sentence is set in 9-point type while the body type on Page 10 is set in 10- point type
Standard unit of measure used to specify type sizes. One point is 1/72 inch (approx. .013837 inch). This text is set in 9-point type while the text material on Page 10 is set in 10-point type.
Effect
Superscript EEmmbboossss Shadow Subscript Underline Kerning
In typography, kerning (less commonly mortising) is the process of adjusting the spacing between characters in a proportional font, usually to achieve a visually pleasing result. In a well kerned font, the two-dimensional blank spaces between each pair of characters all have similar area. The related term kern denotes a part of a type letter that overhangs the edge of the type block.
Leading
Refers to the distance between the baselines of successive lines of type. The term originated in the days of hand-typesetting, when thin strips of lead were inserted into the formes to increase the vertical distance between lines of type. The term is still used in modern page layoutsoftware such as QuarkXPress and Adobe InDesign
In consumer-oriented word processing software, this concept is usually referred to as "line spacing" or "interline spacing."