LaTeX is a historical text markup language created in 1985.

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Example code from the Hello World Collection:

% Hello World! in LaTeX
\documentclass{article}
\begin{document}
Hello World!
\end{document}

Example code from Wikipedia:

\documentclass{article}
\usepackage{amsmath}
\title{\LaTeX}

\begin{document}
  \maketitle
  \LaTeX{} is a document preparation system for
  the \TeX{} typesetting program. It offers
  programmable desktop publishing features and
  extensive facilities for automating most
  aspects of typesetting and desktop publishing,
  including numbering and  cross-referencing,
  tables and figures, page layout,
  bibliographies, and much more. \LaTeX{} was
  originally written in 1984 by Leslie Lamport
  and has become the  dominant method for using
  \TeX; few people write in plain \TeX{} anymore.
  The current version is \LaTeXe.

  % This is a comment, not shown in final output.
  % The following shows typesetting  power of LaTeX:
  \begin{align}
    E_0 &= mc^2 \\
    E &= \frac{mc^2}{\sqrt{1-\frac{v^2}{c^2}}}
  \end{align}  
\end{document}
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Last updated February 11th, 2019