1. When referring to an ATA or IDE, a channel refers to either the Primary channel or Secondary channel and is the connection and IDE drive connects to on the motherboard.
2. With the IBM PS/2 computer, the channel is an expansion bus.
3. In communications, the channel is a path between two computers or devices.
4. With chat or IRC, a channel, which is also known as a room, is a location with a specific chat topic. For example, in the Computer Hope IRC chat our channel is #computerhope.
Also see: Chanserv, Chat terms, Hard drive terms, IRC, Primary channel