What Makes Drupal Special?

Description
A video by Sun Developer Network on Drupal. What makes Drupal so popular? Why is is better than other, even, free and open source alternatives.
The Architecture of Drupal makes the difference. That is why it is viral. It is adopted. Several thousand modules to extend the core. Qucker security updates.
Runs on LAMP/WAMP or the OS,AMP stack. OS is your Operating System- Linux/Windows/Mac, a Web-server[Apache], DataBase[MySQL] and PHP. You can use other Web-Servers or a DataBase.