vBulletin is a customisable forums package. It is based on the PHP language with a MySQL back-end database. Key features include a fast database back end, a template driven interface, a search engine, user profiles, a web admin area, and unlimited forums/posts.

Bulletin (abbreviated as vB) is a commercial Internet forum package produced by Jelsoft Enterprises Ltd. Written in PHP using a My SQL database server, it is comparable to other forum software.