Multicast is a network addressing method for the delivery of information to a group of destinations simultaneously using the most efficient strategy to deliver the messages over each link of the network only once, creating copies only when the links to the multiple destinations split (typically network switches and routers). However, like the User Datagram Protocol, multicast does not guarantee the delivery of a message stream.
Multicast involves sending data to multiple recipients at once using efficient methods that avoid unnecessary duplications (such as through switches and routers). Similar to the User Datagram Protocol, multicast does not ensure reliable delivery of messages.