A nerd is a person seen as overly intellectual, obsessive, introverted or lacking social skills. Additionally, many so-called nerds are described as being shy, quirky, pedantic, and unattractive.

Whats the difference between a nerd and a geek?

Geeks are collection oriented, gathering facts and mementos related to their subject of interest. They are obsessed with the newest, coolest, trendiest things that their subject has to offer. Nerd – A studious intellectual, although again of a particular topic or field.