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IMHO: Email and newsgroup abbreviation of "in my humble opinion." IMO & IMNSHO are variations that aren't humble.

Iming: Instant Messaging, or chatting on-line.

Insertion order (IO): The contract between an ad buyer and the ad seller.

.int: A suffix indicating an international domain. (I've never seen it, but Web Trends assures me it exists.)

Interstitial: A web advertisement that appears on its own page. They aren't clickable, so they've lost popularity since introduced. When a visitor clicked on a link, the ad would appear briefly before the page they wanted.

IO: Insertion Order. It is a binding contract on one piece of paper that outlines the ad sale you are making. It must be signed by your ad client.

IOW: Email and newsgroup abbreviation of "in other words."

IP address: The Internet protocol address identifying a computer connected to the Internet. Every computer (including yours) is assigned one when they log onto the Internet. Servers always use the same IP address, but if you get Internet access through a large dial-up Internet service provider, you may be assigned a new IP address every time you log on to the Internet.

IRC: Internet Relay Chat. A system, which lets you join real-time text conversations over the Internet.

ISDN: Integrated Services Digital Network. A digital alternative to phone lines for connecting to the Internet. Like DSL, it's faster than analog modems, more expensive, and allows you to talk on the phone and be on the Internet at the same time without additional phone lines. I think DSL made ISDN obsolete by being faster and cheaper.

IRL: Chat and newsgroup abbreviation of "in real life."

ISP: Internet Service Provider. These are the companies who supply Internet access to people who don't have their own servers. It is best to find one, which is fast, reliable, and inexpensive. If you travel often, choose a national provider whom you can access from anywhere you're likely to go. If you are overwhelmed by choices, ask your friends if they like their service or visit a website which compares the services in your area.