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]
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] A TeX format makes the system's definitions available to a compatible TeX implementation.

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LaTeX is a document preparation system and markup language primarily used for producing high-quality typographical documents. It is especially popular in academia and among researchers for writing scientific papers, theses, and technical documents that include complex mathematical formulas, citations, and bibliographies. Here are some key features and aspects of LaTeX: 1. **Markup Language**: LaTeX uses plain text files with specific commands and syntax to define the structure and formatting of the document. This makes it highly customizable.
LaTeX by Ciro Santilli 40 Updated 2025-07-16
Revolutionary for its time, and a big part of Ciro's Enlightenment.
But too insane, and did not keep up with internet age, and so Ciro wants to kill it now.