FTP is a file server, and everyone has an account. You can use a privileged account to access files to which you have access. For example, in a school, he can build an FTP file server on the server side of the school and put some documents on the server. Teachers can download courseware from it through distributed accounts, each with its own authority, which is assigned by the network administrator or the principal. Of course, the external network can also be accessed, as long as there is an account. ......