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Reference.org
Datagram
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<p>A datagram is a basic transfer unit associated with a <a href="/facts/Packet-switched_network/olDlDP1R">packet-switched network</a>. Datagrams are typically structured in <a href="/facts/Header_(computing)/DSbn3tM1">header</a> and <a href="/facts/Payload_(computing)/zN2Pgfq6">payload</a> sections. Datagrams provide a <a href="/facts/Connectionless_communication/MfMys8t7">connectionless communication</a> service across a packet-switched network. The delivery, arrival time, and order of arrival of datagrams need not be guaranteed by the network. </p>