Microsoft Word is a word processing program that allows users to create documents like letters, reports, and flyers. It was first developed in 1981 and released in 1983. Word has various tools like formatting options, spellcheck, find and replace, styles, and page layout features to help users create and edit documents. Some key areas of the Word interface include the ribbon, ruler, text area, scroll bars, and status bar. Word also allows adding things like page numbers, comments, headers and footers, and more.