UDP is an abbreviation for User Datagram Protocol. It is one of the core protocols of the Internet protocol suite, which provides simple but unreliable datagram services. Using UDP, programs on networked computers can send short messages sometimes known as datagrams to one another. UDP is a connectionless protocol, which, like TCP, is layered on top of IP. UDP neither guarantees delivery nor does it require a connection. As a result it is lightweight and efficient, but all error processing and retransmission must be taken care of by the application program. Common network applications that use UDP include the Domain Name System (DNS), Voice Over IP (VoIP) and online gaming.
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