This directory contains source code for the parts of Emacs that are written in Emacs Lisp. *.el files are Emacs Lisp source, and the corresponding *.elc files are byte-compiled versions. Byte-compiled files are architecture-independent. The term subdirectory contains Lisp files that customize Emacs for certain terminal types. When Emacs starts, it checks the TERM environment variable to get the terminal type and loads 'term/${TERM}.el' if it exists. The other subdirectories hold Lisp packages grouped by their general purpose.