LaTeX 2026-11-05
LaTeX is a document preparation system built on TeX technology. It lets an author specify structure such as sections and references while reusable definitions control presentation. Its facilities support mathematical typesetting, figures, bibliographies and cross-references.[ref]
An introduction to LaTeX by the LaTeX Project. Introduction and LaTeX Features: document structure and scientific publishing
For example, a minimal mathematical article can contain
\documentclass{article}\begin{document}$x^2+1$\end{document}. The source describes the document class and content; the selected LaTeX definitions and computer fonts help determine the resulting geometry. The same separation lets one change a document's design while retaining its logical section structure.Leslie Lamport developed the system; his LaTeX: A Document Preparation System by Leslie Lamport is listed in his bibliography as an Addison-Wesley publication from 1986.[ref]
LaTeX: A Document Preparation System by Leslie Lamport. Author’s bibliography, entry 69: title and 1986 publication
A TeX format makes the system's definitions available to a compatible TeX implementation.