In this section, I will describe LaTeX especially what is LaTeX, what it can do, its strength and weakness. I will not bother give the introduction on using LaTeX, since there are many good introduction already available. Check "Not So Short Introduction to LaTeX2e". for a good starting place in using LaTeX.
LaTeX is a document preparation system. It is used to produce a document just like what exactly MS Word does, only nicer, simpler and more exquisite.