Drupal is a flexible, powerful content management system. Using Drupal we develop feature-rich websites you can update yourself.
Drupal is used to support major websites from, for example, Sony, the US Government, Symantic and Popular Science. It's a modular system so you can start small and add only those features you need. Drupal can be used to build everything from personal blogs to enterprise applications. Thousands of add-on modules and designs let you build any site you can imagine. And it's open source which means:
While the details may change these advantages of open source software are not unique to Drupal. In fact the vast majority of websites are delivered by another open source product - Apache. You just might be visiting this website using Firefox which is another successful open source project. Both Safari and Chrome are based on the open source software Webkit. Perhaps you're already using LibreOffice (formerly OpenOffice) on your computer which is an open source alternative to the Microsoft Office suite of products.