**Emacs** is a text editor that has been around for over 50 years. It is one of the most popular text editors in the world, and it is used by a wide variety of people, including programmers, writers, and students. It became popular due to its extensibility through Lisp macros, which allowed users to create their own commands or *"lenses"* that could be added onto Emacs's core functionality without having to modify it directly. Additionally, the fact that it is open source has made it easier for people familiar with Lisp (the programming language in which many of its commands were written) to contribute code or create their own extensions without having to worry about copyright or licensing issues. Emacs is still used due to its power, customization, extensibility, free and open source software, portability, and active community.
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