UDP – User Datagram Protocol. This is a method of sending packets of data across an IP (Internet Protocol) network without error checking. An alternative TCP (Transmission Control Protocol) method uses error checking and ensures that packets are too lost and damaged. It is consequently slower than UDP. TCP numbers packets, addresses them and has the receiving address acknowledge delivery. Lost packets are thus detected and retransmitted. UDP simply addresses them. It is used when transmission speed is vital and error correction can be ignored. Eg. UDP is often used for live broadcasts and online games.
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