Why is it said that udp is message oriented and tcp is byte stream oriented?

Why is it said that udp is packet-oriented and tcp is byte stream-oriented?

This depends on their working characteristics:

UDP is message-oriented, The sender's UDP is handed over to the application layer The message is not merged or split, but a header is added to it and then handed over to the network layer below. In other words, no matter how long the message is handed to UDP by the application layer, it will send it all, one at a time. For the receiver, the header is removed directly after receiving it, and the task is completed by handing it over to the application layer above. Therefore, it requires the application layer to control the size of the message.

TCP is oriented to byte streams. It treats the data handed over by the application layer above as an unstructured byte stream and sends it. , it can be imagined as a pipeline form. The sender TCP will put the data into the "reservoir" (cache area), and send it when it can be sent. If it cannot be sent, it will wait. TCP will determine according to the current congestion status of the network. The size of each segment.

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