ADSL: Asymmetric Digital Subscriber Line - the form of DSL most familiar to home and small business users. ADSL is called "asymmetric" because most of its two-way or duplex bandwidth is devoted to the downstream direction, sending data to the user.

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.

DNS: Domain Name System, or by extension, Domain Name Services.

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.