TCP and UDP ports are interactive, that is, they both exist. That is to say, when reading data under these two protocol ports, they are all transmitted with similarity, that is, where the data comes from and where it goes. For example, if you browse or download data from a server that supports TCP or UDP protocol, then TCP or UDP on the remote server can become the source port in this process, and TCP or UDP used by your own machine becomes the target port, and vice versa.

Source address and source port = = destination address and destination port