Index Server - Index Server indexes the contents and properties of documents on an Internet or intranet Web site. Index Server enables Web clients with any browser to search a Web site by filling in the fields of an HTML query form.
IRC (Internet Relay Chat) - Basically a huge multi-user live chat facility. There are a number of major IRC servers around the world which are linked to each other. Anyone can create a channel and anything that anyone types in a given channel is seen by all others in the channel. Private channels can (and are) created for multi-person conference calls.
ISDN (Integrated Services Digital Network) - Basically a way to move more data over existing regular phone lines. ISDN is rapidly becoming available to much of the USA and in most markets it is priced very comparably to standard analog phone circuits. It can provide speeds of roughly 128,000 bits-per-second over regular phone lines. In practice, most people will be limited to 56,000 or 64,000 bits-per-second.
ISP (Internet Service Provider) - An institution that provides access to the Internet in some form, usually for money.
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