What is Drupal?
Drupal is a free and open source modular framework and Content Management System (CMS) written in PHP that's flexible enough to be right choice for a wide variety of applications. From simple brochure websites to complex e-commerce systems, intranets/extranets, publishing platforms and much more.
Some of the World's biggest and most popular websites are powered by Drupal, The White House, MTV UK and Data.gov.uk are just a few examples of notable Drupal sites. That should give you an indication of Drupal's fast growing popularity and its suitability for many purposes.
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Drupal's vibrant community is its greatest asset, with hundreds of thousands of developers, site administrators, and end-users constantly developing, testing, and using the system on a daily basis. This provides an extremely robust foundation on which we can implement any type of site for our clients, safe in the knowledge that the systems we build are secure, reliable and future proof.
Drupal Association
Drupal Developer Reference
DrupalContrib API was created by Freestyle Systems for Drupal developers who need access to reference documentation for Drupal's most popular contributed modules.
If you're a Drupal developer you'll no doubt find our resource invaluable!

