LaTeX is a widely-used macro package for TeX, providing many basic
document formating commands extended by a wide range of packages.  It
is a development of Leslie Lamport's original LaTeX 2.09, and
superseded the older system in June 1994.  This package includes
a bunch of required packages, which LaTeX authors are "entitled to
assume" will be present on any system running LaTeX.

Homepage:
https://ctan.org/pkg/latex
