Drupal is an open source software package that allows an individual or a community of users to publish, manage and organize a wide variety of content on a website. Tens of thousands of people and organizations are using Drupal to power scores of different web sites, including:

Community web portals
Discussion sites
Corporate web sites
Intranet applications
Personal web sites or blogs
Aficionado sites
E-commerce applications
Resource directories
Social Networking sites