This document provides an introduction to LaTeX, covering its history and origins, installation, basic document structure, fonts and formatting, tables, figures, lists, references, mathematics typesetting, code listings, bibliography features, TikZ graphics, and useful LaTeX resources. It describes LaTeX as a document markup language released in 1984 as an abbreviation of Lamport TeX, based on the TeX typesetting system developed by Donald Knuth in 1978.