LyX is a document processor that encourages an approach to writing
based on the structure of your documents, not their appearance. The
author can concentrate on the content (What You See Is What You Mean).
The formatting is done by the backends (like LaTeX) and the output can
have different formats, such as DVI, postscript, PDF, html.

LyX can check the LaTeX installation by opening the LaTeX Configuration
document under "Help" on the menubar.