Defined in the jargonfile as a pejorative applied to anyone with an above-average IQ and few gifts at small talk and ordinary social rituals. I don't think you really want to be one of these.

In pre-InterNet land, a Nerd and a Geek were roughly the same thing. Today, a Geek is someone with a passion for technical pursuits (usually, but not necessarily, computer-related), while a Nerd is the stereotypical RPG-playing social outcast who is so tied up in their passion they don't see anything else, like making time for PersonalHygiene or stepping into the BigBlueRoom.

"The difference between a Geek and a Nerd is that the geek can get chicks."