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What is Drupal?
Screencast series: Introduction to Drupal
Setup: 07-Sep-2013 
Here's my recently created introduction to Drupal. This is mostly for developers, but it may be of interest to others who would like a better insight into the inner workings of Drupal. In this series, I make the case that Drupal can be well understood by thinking about its five main properties:
This series basically contains the introduction I wish I'd had when I started out with Drupal.
Here are the slides:
Here's the whole video series (over 2 hrs). For the individual videos, see the topic details