LaTeX is an excellent and ubiquitous typesetting language.
It can be used in many different instances, including in this blog. The text you see below surrounded by dashed lines is all interpreted code.
Writing in is relatively easy as most of it is plain text but it does take a little while to get used to the conventions.
The following is a collection of some tips for working with it:
Converting LaTeX Docs
How do I convert my LaTeX files to HTML?