a form of network communication in which one sender emits packets (or, more generally, network transmission units) that have exactly one destination address. Unicast is one-on-one communication; when you are downloading mail, the POP conversation between you and your mail server is unicast traffic.

contrast unicast with broadcast and multicast. For a specific type of unicast, see IP Unicast - although unicasting is by no means limited or specific to IP.

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