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Terminology
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UDP (User Datagram Protocol)
A protocol within the TCP/IP protocol suite that is used in place
of TCP when a reliable delivery is not required. For example, UDP
is used for real-time audio and video traffic where lost packets
are simply ignored, because there is no time to retransmit. If UDP
is used and a reliable delivery is required, packet sequence
checking and error notification must be written into the applications.