They have an incredible passion for knowledge, but fit into society. Geeks are able to communicate with other geeks, also with Nerds, Regular People, and even dorks.
Nerds can communicate effectively only with other nerds & tolerant geeks.
Dorks often can’t effectively communicate.
Geek = good grades in school, popular, often athletic. Graduates & gets a good job, a hot wife (or husband if female), and raises future geeks