Format is related to form and most commonly refer to the shape or dimensions of pages in printing and page layout. Derivatives of that include:
Paper format, standard paper sizes such as American Letter and international A-format
Newspaper format, the size of the pages in newspapers, for example tabloid format
Text formatting, the typesetting of text elements
Film format, refers to size and shape as well as other characteristics of photographic film or film stock and for projected film such as motion pictures and slide film also of the projection
In computing it mostly refers to:
File format, particular way that information is encoded for storage in a computer file
Document file format, for storing documents on a storage media, especially for use by computer
Media file formats, for storing digital media such as video and audio data on a computer system
In music it mostly refers to:
The reproduction medium of a recording, such as vinyl, tape, cassette, CD and later on digital download formats or most recently as streaming media
The format of a recording can also describe how it is compiled, irrespective of distribution medium, such as album, EP or single
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