Drupal is a popular open-source CMS designed in PHP and is available under GNU. It is also sometimes referred to as web application framework. Being highly sophisticated and enjoying big developer base (30000 voluntary developers), it enjoys acceptability among various comprehensive and important web portals across the world in 228 countries and 182 languages.
Drupal is has a variety of tools and templates to enable users to create, and manage content of various types with an incomparable ease. It also enjoys cross platform portability and facilitates functioning of web servers running PHP and database for storing content and settings.