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User Datagram Protocol (UDP) is a network communication protocol that is used for transmitting datagrams over the internet or other network connections. It is a connectionless protocol that doesn't establish a dedicated end-to-end connection between the sender and receiver before sending data.

UDP is a very lightweight protocol, and it is often used for applications that require fast, low-latency transmission, such as online gaming, video streaming, and voice over IP (VoIP) services. Since it doesn't include many of the reliability features of other protocols, such as TCP, UDP is generally faster but less reliable.

UDP is an alternative to the Transmission Control Protocol (TCP), which is a connection-oriented protocol that provides reliable data transmission by guaranteeing that packets are delivered in order and without error. In contrast, UDP doesn't provide any reliability features, so it's up to the application to handle any data loss or errors that may occur during transmission.

Overall, UDP is a useful protocol for applications that prioritize speed and low latency over reliability, while TCP is better suited for applications that require high reliability and data integrity.