Internet Relay Chat (IRC):
the ability to converse directly with another person.

Internet Service Provider (ISP):
also known as Internet Access Providers, ISPs are companies that provide subscribers with temporary telephone connections to the Internet.

Joint Photographic Experts Group (jpeg):
a means of publishing photos on the Internet.

Listservs:
an e-mail address that is configured to forward every message it receives to the e-mail addresses of those who subscribe to it.