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packet switching. n. A method of data transmission in which data is broken into small blocks that are transmitted over different channels and are reassembled into their original order at their destination.
A packet is a series of digital numbers basically, which conveys these things: The data, acknowledgment, request or command from the originating system. The source and destination IP addresses. The source and destination ports. Information about the protocol (set of rules) by which the packet is to be handled.