This package manages culturally-determined typographical (and other) rules for a wide range of languages. A document may select a single language to be supported, or it may select several, in which case the document may switch from one language to another in a variety of ways. Babel uses contributed configuration files that provide the detail of what has to be done for each language. Included is also a set of ini files for about 200 languages. Many language styles work with pdfLaTeX, as well as with XeLaTeX and LuaLaTeX, out of the box. A few even work with plain formats.