LaTeX - Text markup language

LaTeX is an open source text markup language created in 1985 by Leslie Lamport.

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LaTeX (IPA: , LAH-tekh, also pronounced as , LAY-tekh, a shortening of Lamport TeX) is a document preparation system. When writing, the writer uses plain text as opposed to the formatted text found in WYSIWYG word processors like Microsoft Word, LibreOffice Writer and Apple Pages. The writer uses markup tagging conventions to define the general structure of a document (such as article, book, and letter), to stylise text throughout a document (such as bold and italics), and to add citations and cross-references. Read more on Wikipedia...

Tags: text markup language
Early development of LaTeX happened in https://www.latex-project.org/about/team/
Explore LaTeX snippets on Rosetta Code
LaTeX on HOPL
LaTeX LSP implementation
latex-project.org was registered in 1998
See also: (14 related languages) Tex, PDF, XML, CSS, HTML, XeTeX, Solaris, FreeBSD, Linux, PostScript, LyX, Perl, Unix, BibTeX
9 PLDB concepts link to LaTeX: AsciiMath, Desmos, eqn, Frundis, Knitr, MathJax, sile, Sweave, Typst

Example from hello-world:

\documentclass{article}
\begin{document}
Hello World
\end{document}

Example from the Hello World Collection:

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

Example 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}

Language features

Feature	Supported	Example	Token
Line Comments	✓	% A comment	%
Comments	✓
Case Insensitive Identifiers	X
Semantic Indentation	X
MultiLine Comments	X