: Text processor.

is a macro package. is a package for typesetting technical text, especially text which contains mathematical formulas.

This book was written using , as were the overheads (transparencies) used during the course.

All formatting in is done by the use of macros. By telling what type of document you are preparing, the margins will be set automatically. A few document types include article, report, book, and letter. Some features of include automatic hyphenation, line justification, centering, tabular aligning, and much more.

The definitive reference is ``: A Document Preparation System" by Leslie Lamport.