
About TeX Distributions
TeX Distributions are collections of processors, macros libraries and fonts that help you typeset your documents.
You can obtain them from various sources either free or commercial. They are basically the same and may differ on some limited area and program version.
On Mac OS X, there is basically one distributions. MacTeX is an all-in-one package wrapping the TeXLive distribution and the necessary tools to run TeX with a minimum of comfort.