What is a Nerd?

Anyone who works with computers in any capacity will sooner or later be called a geek or a nerd, but what exactly is it that you are being called? Is it a badge of honor to be proudly displayed or a shameful slur towards your mental superiority? There will still be people who are ostracized for their social skills or interests, and some of them will like gaming and superheroes, but the term has gone far beyond that. "Nerd" has a definition, and it's used by a subculture, but it's really a catch-all.