Description:

LaTeX is a front end for the TeX text formatting system. Easier to
use than TeX, LaTeX is essentially a set of TeX macros which provide
convenient, predefined document formats for users.

If you are installing tetex, so that you can use the TeX text
formatting system, you will also need to install tetex-latex. In
addition, you will need to install tetex-afm (for converting
PostScript font description files),
tetex-dvips (for converting .dvi files to PostScript format for
printing on PostScript printers), and tetex-xdvi (for previewing .dvi
files in X). If you are not an expert at TeX, you should also install
the tetex-doc package, which contains documentation for TeX.