This article is about the text editor. For the unrelated Apple Macintosh computer model, see eMac.

Emacs refers to a class of text editors, possessing an extensive set of features, that are popular with computer programmers and other technically proficient computer users. The original EMACS, a set of Editor MACroS for the TECO editor, was written in 1975 by Richard Stallman, initially put together with Guy Steele. It was inspired by the ideas of TECMAC and TMACS, a pair of TECO-macro editors written by Guy Steele, Dave Moon, Richard Greenblatt, Charles Frankston, and others. Many versions of Emacs have appeared over the years, but nowadays there are two that are commonly used: GNU Emacs, started by Richard Stallman in 1984 and still maintained by him, and XEmacs, a fork of GNU Emacs which was started in 1991 and has remained mostly compatible. Both use a powerful extension language, Emacs Lisp, that allows them to handle tasks ranging from writing and compiling computer programs to browsing the web.

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