+A **datagram** is a self-contained, independent unit of data carrying enough information to be routed from a source to a destination without prior establishment of a [connection](/wiki/connection). It travels across a [network](/wiki/network) like a letter in an envelope, its journey often unbound by a persistent session.
+## See also
+- [Packet](/wiki/packet)
+- [IP](/wiki/IP)
+- [UDP](/wiki/UDP)
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