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Emacs is an [[open source ]] text editor which is used mainly by luddite computer programmers. It is designed to be arcane enough that it requires an extensive amount meet the demands of time to learn IT professionals, providing a suite of tools which often require extensive programming knowledge to operate efficientlyunderstand or exploit fully.

Emacs Lisp (often known to professionals as elisp) is the prominent programming through which Emacs operates. The majority of Emacs features and tools are written in elisp, running above an Emacs ''kernel'' that is written in C. Professional Emacs users commonly spend a great deal of time customizing and supplementing the elisp portion of Emacs in order to better tailor Emacs to their needs.