What is a modem?

A modem allows you to send and receive information over the phone line with your computer. You could send a picture of your dog to a friend, or receive (download) a document sent to you via email.

"Modem" is an acronym that stands for "MOdulator/DEModulator". These are the technical terms for the way your modem converts information you send from your computer into sounds (the MOdulator part) which a modem on the other end of the phone line can translate back into information (the DEModulator part).

Also see:

• At IUB, what should I do if I'm having problems using my modem with my office telephone?
• Can a phone plugged into the line hinder my modem?
• What should I do if my modem gives me a "No dial tone" error?
• What are some common modem terms?
• In Windows, how can I tell what modem I have?