It seems that to many users of computers and the internet, Drupal may mean nothing at all, but without it many websites would not even work at all and then there would be something to complain about!
This interesting info graphic answers many of the questions that people have and some that they may not have even thought of, so this is a comprehensive graphic on what Drupal is and what it used for.
Some for the features on this info graphic answer the following questions;
What is Drupal?
Where does name “Drupal” come from?
History of Drupal?
Number of Drupal modules
Number of Drupal themes
Growth of DrupalCon attendees
Top Drupal websites
As well as the ultimate Drupal rule: Don’t hack the core!
Source [Mog Design]