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LaTeX (stylized as LaTeX) is a document preparation system and document markup language. LaTeX uses the TeX typesetting program for formatting its output, and is itself written in the TeX macro language. LaTeX is not the name of a particular editing program, but refers to the encoding or tagging conventions that are used in LaTeX documents. LateX is very suitable for producing scientific and mathematical documents of high typographical quality. It is also suitable for producing all sorts of other documents, from simple letters to complete books.
Popular LaTeX Distributions
Distributions make it easy to get started with LaTeX by bundling everything you need to get started.