UDP
The User Datagram Protocol (UDP) is a very minimalist, connectionless network protocol for IP networks and is considered insecure and unreliable. Data packets are sent to ports on the destination computer. There is no guarantee that a packet will arrive in the correct order, only that it will reach the intended recipient and arrive at all. A checksum sent with the packet allows for the detection and discarding of incorrectly transmitted data units (datagrams).