Frivolous Unanticipated Nonsense. A term coined by Vance Stevens, Webheads in Action coordinanator to describe the fun we have in between our academic chats ;-)
GIF Graphical Interchange Format. A format that is, together with JPG / JPEG, the most common way to store pictures on Web pages.. GIF is considered best for lower quality images and animations.
HTML / html HyperText Markup Language; the language for publishing Web pages that is based on tags (codes), which represent instructions or commands for the Web browser.
Homepage, home page The first page you see when you access or log into a Web site.
Hyperlink A piece of text or a graphic that when clicked on with the mouse will take you to a different place on that same Web page or to another Web page.
Interactive A two-way communications system that allows users to connect and be in touch with other users or machines/computers and get responses (e.g. completing a survey, filling in a form).
IP address A unique address for a computer on the Internet. Usually a number.
Java A programming language from Sun Microsystem that allows users to run a variety of programs on the WWW.
JPG / JPEG Joint Photographic Experts Group: a common format for displaying high-quality color and grayscale photos on Web pages.
Link A piece of text or image on a webpage which, when clicked on, takes the user to another page or website.
Listserv An automated mailing list distribution system; a program that manages distribution lists.
Login, log in The act of accessing email, a Web page, a remote computer, a network, etc, by keyboarding a username and a password (registered in advance).
Lurk(ing), lurker To be part of a mailing list or newsgroup as an observer who reads the messages, but does not participate in the discussions; it's a recommended practice in the first few weeks after joining a list in order to grasp the spirit of the list and the way it works.
Mailing list An automated email system similar to a listserv.
Mirror site A site that replicates the content of another site.
Netiquette The etiquette of Internet usage
Newbie A newcomer to Internet.
Online Connected to the Internet (through a network or an ISP); on the Internet.
Online community A group of people with common interests who meet in a predetermined place on the Internet (e.g. Webheads in Action meet at Tapped In every Sunday at 12.00 GMT).
Password A secret code made up of letters, numbers and /or symbols necessary to enter a computer system or site as an authorized user (e.g. your password to enter Yahoo Groups or Yahoo Mail).

This definition is in context to Internet. See more contextual defintions for F.U.N.