the shape and size of a book as determined by the number of times the original sheet has been folded to form
the general physical appearance of a book, magazine, or newspaper, such as the typeface, binding, quality of paper, margins, etc.
the organization, plan, style, or type of something: The format of the show allowed for topical and controversial gags.
Computers. the arrangement of data for computer input or output, such as the number and size of fields in a record or the spacing and punctuation of information in a report.