what is multicast used for
unicast. geocast. In computer networking, multicast (one-to-many or many-to-many distribution) is group communication where information is addressed to a group of destination computers simultaneously. Multicast should not be confused with physical layer point-to-multipoint communication.P multicast is a technique for one-to-many communication over an IP infrastructure in a network. The destination nodes send join and leave messages, for example in the case of Internet television when the user changes from one TV channel to another.