Speed: Modem speeds vary from 300-56,600 Bps. More common speeds include 14.4 and 28.8, 56.6 Kbs. The faster the modem, the more it will cost.

Many people think that if they buy a cheaper modem they will save money. But in the long run, a faster modem will save you money. If you use an online service, you will use less connect time, and you can upload and download information faster.

Internal or External: If you don't have much desk space, an internal modem is the way to go. These are usually less expensive than an external modem. However, if you need to move your modem from PC to PC, an external modem is the right choice. But an external does need a separate cable and free serial port.

MNP or V.42: This is a standard protocol for high speed modems. Remember, that your MNP modem can only take advantage of the advanced features of MNP if it is talking to another MNP modem.

Hayes compatible: This is the modem communications standard for the industry. Make sure the modem you buy follows this standard.

Fax modem: Most modems today have fax capabilities. That means you can take a document that you created with your word processor and send it electronically through your modem to another fax machine. You can also receive fax documents. CCITT Group 3 Fax is the fax standard to look for.

Voice modem: This modem allows you to transmit and receive data, or have a regular telephone conversation. Some modems can also act as your answering machine and store messages to your hard disk. They can also support Caller ID. But, you have to leave your PC on all the time.

Plug and Play or PnP: If you have Windows 95 or higher buy this type of modem. They are easier to install.