Description:

AUC TeX is a comprehensive customizable integrated environment for
writing input files for LaTeX using GNU Emacs and XEmacs.

AUC TeX lets you run TeX/LaTeX and other LaTeX-related tools, such as
a output filters or post processor from inside [X]Emacs. Especially
"Running LaTeX" is interesting, as AUC TeX lets you browse through the
errors TeX reported, while it moves the cursor directly to the
reported error, and displays some documentation for that particular
error. This will even work when the document is spread over several
files.

AUC TeX automatically indents your "LaTeX-source", not only as you
write it -- you can also let it indent and format an entire document.
It has a special outline feature, which can greatly help you getting
an overview of a document.

Apart from these special features, AUC TeX provides a large range of
handy [X]Emacs macros, which in several different ways can help you
write your LaTeX documents fast and painlessly.