Original Link: http://wp.smashingmagazine.com/2011/11/15/getting-started-with-bbpress/

Forums have been around forever, so it should come as no surprise that several plugins for the popular publishing platform WordPress provide this feature, as well as support for integrating other forum software. One project, however, has a special place in the WordPress community, and that is bbPress. This is the software created by WordPress founder, Matt Mullenweg, as a lightweight system for the WordPress.org support forums. In true open-source fashion, the bbPress project was born (at bbpress.org, of course) as a lightweight standalone alternative for forums.