Latex is a typesetting system that 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.
Latex uses Tex as its formatting engine.
This short introduction describes Latex and should be sufficient for most applications of Latex.
Samurai Media Limited Latex in 157 minutes: the (not so) short introduction to latex, paperback/tobias oetiker
