TeX is a computer program for typesetting documents, created by Donald Knuth.
It takes a suitably prepared computer file and converts it to a form
which may be printed on many kinds of printers, including dot-matrix
printers, laser printers and high-resolution typesetting machines. LaTeX
is a set of macros for TeX that aims at reducing the user's task to the
sole role of writing the content, LaTeX taking care of all the
formatting process. A number of well-established publishers now use TeX
or LaTeX to typeset books and mathematical journals. It is also well
appreciated by users caring about typography, consistent formatting,
efficient collaborative writing and open formats.