Packet

A unit of data sent across a network which may contain identify and routing information. When a large block of data is to be sent over a network, it is broken up into several packets, sent, and then reassembled at the other end. The exact layout of an individual packet is determined by the protocol being used.

1. In data communication, a sequence of binary digits, including data and control signals, that is transmitted and switched as a composite whole. Note: The data, control signals, and possibly error control information, are arranged in a specific format. 2. The fundamental unit of communication on the Internet.