Private Network - A connection that allows a select group of subscribers to communicate with each other but no one else.

PAN (Personal Area Network) - Typically a short range communication network among computer related devices such as telephones, fax machines, PDAs and digital media adapters. While the PAN may extend only a few yards, it  can be used to link to other networks such as the Internet. Some don't consider a WPAN to be a separate category. See Home Networking.

WPAN (Wireless Personal Area Network) A PAN using wireless network technologies.