what is Drupal?
Drupal is an open source content management platform powering millions of websites and applications. It’s built, used, and supported by an active and diverse community of people around the world. Drupal is a free software package that allows you to easily organize, manage and publish your content, with an endless variety of customization.

Drupal is Open Source
Drupal is open source software maintained and developed by a community of 630,000+ users and developers. It’s distributed under the terms of the GNU General Public License (or “GPL”), which means anyone is free to download it and share it with others. This open development model means that people are constantly working to make sure Drupal is a cutting-edge platform that supports the latest technologies that the Web has to offer. The Drupal project’s principles encourage modularity, standards, collaboration, ease-of-use, and more.more info