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Emacs (Editor MACroS) is an extensible, customizable, text editor. At its core is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing.
It is often lovingly referred to as its own self-contained operating system. There is a humors feud between users of VIM and users of Emacs. Followers of Emacs are called members of The Church of Emacs. You can read about this here.
This was the first program released by the GNU Project.
If you want to learn how to use and configure GNU Emacs you can start by following Uncle Dave's tutorials