This document is a technical presentation about LaTeX that includes: 1) An explanation of what LaTeX is, how it was developed by Leslie Lamport to make reports and documents, and how it is strong for writing mathematical formulas. 2) A comparison of Word and LaTeX, noting that Word is expensive while LaTeX is free, and that LaTeX is very useful for writing mathematical formulas while Word is not. 3) Instructions for how to use LaTeX in Windows, which requires installing related LaTeX software like TeX installer 3 in addition to the LaTeX core, in order to compile source code files into PDF or DVI format.