LaTeX is a professional level, software typesetting system used widely throughout scientific and academic circles because of its ability to beautifully set mathematical equations and complex formulas far beyond the ability of many other programs available.
In addition to mathematical formulae, LaTeX is ideal for long documents that run into hundreds or even thousands of pages. LaTeX is used to create PhD theses, books, articles and journals.
Having worked with LaTeX so much during my University years and created the LaTeX Thesis Template, there are a few more resources that you may find very useful to look through
More Than Text
LaTeX can initially feel awkward and clumsy until you get up to speed (if you’re learning it) but it does have a few tricks up its sleeve that may just surprise you.