Dungeons and Dragons

I'm going to say this; I have no clue what Dungeons and Dragons is.  All I know is that it is some kind of board game that people play.  It is more so associated with nerds dressed up in cheap character outfits from the game playing it in their mothers basement.  Although this article did shed some light on the subject; 1. it was thought to promote Satanism. 2. In the 38 years since its creation, it’s been played by upwards of 20 million people and (3) it is still going.  My two opinions: I don't really like D&D, (sci-fi isn't my thing) and I just don't get how people like it.  And my question; WHY! Why is it still here?!?