CiviCRM is a constituent relationship management system that integrates with Drupal.
That's the simple version of the story.
Now here's what was overheard at Port Royal last night: 'Dude -- do you not realize the ground you're walking on is littered with corpses?'
Don't let the next lot of corpses include yours.
If you're working (fighting) with CiviCRM now, if you've worked with it in the past, or you know that you'll be needing to use it in the future, come along and we'll share experiences, tips, and code.