Phpbb is a content management system (CMS) and the most widely-used free and open source bulletin board system in the world. It features an extensive administration panel, which allows the customisation of even the most intricate features without having to edit code directly. Phpbb also has a substantial database of user-created extensions that make adding and adjusting features as simple copy and pasting code into the appropriate files. It includes support for multiple database engines such as PostgreSQL, SQLite, MySQL, Oracle Database, and Microsoft SQL Server.