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Instant Messaging is...

...a type of communications service that enables the creation of private "chat rooms" for two or more people. Individuals are usually identified by "screen names"--aliases akin to Citizens Band (CB) radio handles.

Typically, instant messaging systems alert users whenever any of their designated "buddies" gets on line. Users can then initiate a chat session with the other individual(s). Often, users can select options to make themselves visually more distinctive within the conversation, usually by selecting font and color options to distinguish their text from the text of others. There are several competing instant messaging systems, most of which can be used together.
   
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Why Use Instant Messaging?

Instant messaging is great for quick and informal online conversation. Unlike e-mail, instant messages are not stored for later retrieval. Thus, instant messaging is best suited for the quick exchange of information, especially concerning ephemeral matters, such as reviewing instructions or providing instant feedback. In this way, instant messaging shares many characteristics with phone conversation.

How to Use Instant Messaging:

Instant messaging requires a connection to the Internet and specialized client software. As with e-mail, several vendors offer free software. Leading products include AOL Instant Messanger, ICQ, MSN Messenger, and Yahoo!Messenger. (Before visiting these vendors' Web sites, review our overviews of these products.)

The major products all work in the same way. Once you've downloaded and installed the software on your personal computer, you register with the vendor's service, chosing a screen name by which you'll be identified to the service and to other users. When using the software, you're actually sending your communications and connecting to others via the vendor's instant messaging server.

For more information on instant messaging, visit LearntheNet.com and CNET's review of IM software.