**Introduction to Multicast**

Sending traffic from one source to a single destination is called unicast. Sending traffic from one source to everyone in the subnet is called a broadcast. Sending traffic from one (or multiple) sources to a group of receivers is called multicast. These lessons explain the different protocols we require to make multicast work on our routers and switches.

https://networklessons.com/multicast/introduction-to-multicast

https://networklessons.com/multicast