Packet

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A packet is the fundamentl unit of data carriage in modern data networking; is consists of a block of data, the 'payload', and a 'header', which contains the information needed to get the packet from the source to the destination.

(A useful analogy can be made to a physical letter, in which the wrapper, the envelope, carries the information needed to get the letter from the sender to the recipient; the actual message is carried inside.)