In saving a new electronic document, you must choose a format, for instance PDF, Word doc, or XML, which dictates how the information is to be organized, displayed, and manipulated.
To format information is to arrange it according to preexisting parameters. Electronic files require a format or, more commonly, a "file type," so computers will know how to open, read, and change them. Entertainment media are delivered in such varied formats as VHS, CD, DVD, MP3, and MOV. In the world of AM/FM radio, format is the type of music a station plays, such as top-40, urban, dance, or country.