UDP

Stands for "User Datagram Protocol." It is part of the TCP/IP suite of protocols used for data transfers. UDP is a known as a “stateless” protocol, meaning it doesn't acknowledge that the packets being sent have been received. For this reason, the UDP protocol is used for streaming media. Though you might see skips in video or hear some fuzz in audio clips, it's better than having to wait for the delayed packets, causing the clip to completely stop.