GNU Emacs Manual - Seventeenth Edition, Updated for Emacs Version 24.2

GNU Emacs is much more than a text editor; over the years it has expanded into an entire work flow environment. Programmers are impressed by its integrated debugging and project management features. Emacs is also a multi-lingual text editor, can handle all your email and Usenet news needs, display web pages, and even has a diary and a calendar for your appointments. When you tire of all the work you can accomplish with it, Emacs contains games to play.”