UDP
An abbreviation for User Datagram Protocol, UDP is an Open Systems Interconnection (OSI) transport layer protocol for client/server network applications based on Internet Protocol (IP). UDP is the primary alternative to the Transmission Control Protocol (TCP) and is used to send messages (datagrams), to other hosts on an IP network. UDP messages can be sent to one host, a group of hosts (multicast), or all hosts (broadcast) on an IP subnet.