Emacs Lisp is a programming language built into the Emacs text editor, allowing users to customize and extend its functionality. It is a dialect of Lisp, a family of programming languages known for their simple syntax and powerful features. With Emacs Lisp, users can write scripts to automate tasks, create new commands, and modify the editor's behavior to suit their needs. One of the key strengths of Emacs Lisp is its ability to manipulate text and buffers, making it ideal for tasks like code editing and document processing. This flexibility has led to a vibrant community that shares packages and extensions, enhancing the overall Emacs experience for users around the world.