UDP (User Datagram Protocol)

The TCP/IP standard protocol that allows an application program on one machine to send a datagram to an application program on another machine. UDP uses the Internet Protocol (IP) to deliver datagrams. Conceptually, the important difference between UDP datagrams and IP datagrams is that UDP includes a protocol port number, allowing the sender to distinguish among multiple destinations (application programs) on the remote machine. In practice, UDP also includes a checksum over the data being sent.