A Nerd is is a descriptive term, often used pejoratively, indicating that a person is overly intellectual, obsessive, or lacking social skills. They may spend inordinate amounts of time on unpopular, obscure, or non-mainstream activities, which are generally either highly technical or relating to topics of fiction or fantasy, to the exclusion of more mainstream activities.[1][2][3] Additionally, many nerds are described as being shy, quirky, and unattractive,[4] and may have difficulty participating in, or even following, sports. Though originally derogatory, "Nerd" is a stereotypical term, but as with other pejoratives, it has been reclaimed and redefined by some as a term of pride and group identity.

Geek is a slang term originally used to describe eccentric or non-mainstream people; in current use, the word typically connotes an expert or enthusiast or a person obsessed with a hobby or intellectual pursuit, with a general pejorative meaning of a "peculiar or otherwise dislikable person, esp[ecially] one who is perceived to be overly intellectual".[1]

Although often considered as a pejorative, the term is also used self-referentially without malice or as a source of pride. Its meaning has evolved to connote "someone who is interested in a subject (usually intellectual or complex) for its own sake".