TeX is Donald E. Knuths typesetting language and LaTeX is Leslie Lamport's adaptation of TeX to create an easier to use typesetting system. I wrote my Honors Thesis in LaTeX , the results were most satisfying. there are several sites dedicated to TeX & LaTeX stuff see http://tug.org/ and Comprehensive TeX Archive Network (CTAN) and many more see the end of the Tex & LaTeX articles on wikipedia also see LaTeX Home Page.