What is Format ?
Format is (noun) 1. a shape or size that something is made in What format do you want your invitations printed in? 2. the measurements of a page or book Printers can handle all sorts of book formats. 3. thestyle of a computer disk My computer can’t read that disk it’s the wrong format. (verb) 1. to format a document to arrangetext on a computer, so that it is ready for final printing Style sheets are used to format documents. 2. to prepare a computer disk so that it is ready to receive data You have to format the disk before you can save data on it. (NOTE: formatting formatted)
source: Easier English, Student Dictionary Upper Intermediate Level