VoIP (Voice over Internet Protocol): Technology used to make telephone calls via the Internet. Three methods are available: PC to PC, PC to fixed-network lines, and telephone calls via IP-based internal networks.

Cache: Generally refers to an amount of quickly accessible memory in your computer. However, on the Web it more commonly refers to where the browser stores downloaded graphics on the user's computer. That way, when the user has to reload the graphics, the browser retrieves it from the computer much quicker than reloading it from the Internet.

Internet Protocol (IP): Method or protocol by which data is sent from one computer to another on the Internet. Each computer (known as a host) on the Internet has at least one IP address that uniquely identifies it from all other computers on the Internet.

Traceroute: An operation of sending trace packets for determining information; traces the route of UDP packets for the local host to a remote host. Normally traceroute displays the time and location of the route taken to reach its destination computer.