LaTeX is a document preparation system for high-quality typesetting. It is most often used for medium-to-large technical or scientific documents but it can be used for almost any form of publishing. LaTeX is not a word processor! Instead, LaTeX encourages authors not to worry too much about the appearance of their documents but to concentrate on getting the right content. LaTeX is available as free software. --https://latex-project.org

In Microsoft Word, What You See Is What You Get !

In LaTeX, What You See Is What You Mean !

TeX Distributions

TeX Live

an easy way to get up and running with the TeX document production system for Windows & Mac

MiKTeX

(pronounced mick-tech) is an up-to-date implementation of TeX/LaTeX and related programs for Windows

MacTeX

an Mac OS X install package providing a completely configured and ready-to-use version of TeX Live

TeX Editors