Multicast VPN is a networking technology that allows multiple users to receive the same data stream simultaneously over a virtual private network. This is particularly useful for applications like video conferencing or live streaming, where the same content needs to be delivered to many users at once without sending multiple copies of the data. By using multicast protocols, such as Protocol Independent Multicast (PIM), a Multicast VPN efficiently manages bandwidth and reduces network congestion. It ensures that data is sent only once across the network, while still reaching all intended recipients, making it a cost-effective solution for organizations needing to share information widely.