Drupal is an open-source content management system that organisations use to build and manage websites and web applications. Modules extend its functionality, while themes control how content is presented. It is used by government agencies, media companies, universities and non-profit organisations. The software is released under the GNU General Public License and carries no licence fees. You install and operate Drupal yourself, on infrastructure of your choosing.
Development is carried out by a global open-source community. The Drupal Association, a non-profit organisation headquartered in Portland, Oregon (United States), supports the project but states that it has no authority over the planning, functionality and development of the software. Because Drupal is a self-hostable product, you decide where the data resides: with a European hosting provider or in your own data centre in the EU. There is no mandatory vendor cloud. The open source code lets you inspect and adapt the software, or have another party maintain it for you.