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These three terms describe how many recipients a piece of network traffic is addressed to.
Unicast: One to One
The vast majority of internet traffic, including regular website visits, is unicast — one sender communicating with exactly one recipient.
Multicast: One to Many (Selected)
Multicast sends data to a specific group of interested recipients simultaneously, efficient for things like streaming the same live video to many subscribed viewers at once.
Broadcast: One to Everyone
Broadcast sends data to every device on a local network, used sparingly since it generates traffic for devices that may not need it at all.
