UDP user datagram protocol is a connectionless and simple datagram-oriented transport layer protocol. UDP does not provide reliability, it just sends out datagrams sent by applications to the IP layer, but it does not guarantee that they will reach their destinations. Because UDP does not need to establish a connection between the client and the server before transmitting the datagram, and there is no mechanism such as overtime retransmission, the transmission speed is very fast.
UDP is a connectionless protocol. Each datagram is an independent message, including a complete source address or destination address. It is transmitted to the destination through any possible path on the network, so there is no guarantee whether it can reach the destination, the arrival time and the correctness of the content.
Extended data:
UDP is a connectionless communication protocol. UDP data includes destination port number and source port number information. Because communication does not require a connection, it can be broadcast. ?
UDP has a size limit when transmitting data, and each transmitted datagram must be limited to 64KB. UDP is an unreliable protocol, and the datagrams sent by the sender do not necessarily arrive at the receiver in the same order.
UDP is a message-oriented protocol, and there is no need to establish a connection when communicating, so data transmission is naturally unreliable. UDP is usually used for multipoint communication and real-time data service.
References:
Baidu encyclopedia -UDP