FTP protocol

​FTP is a data transfer protocol. FTP uses TCP ports 20 and 21 for data transmission and authentication. Communication in FTP is not encrypted therefore it is possible to sniff network traffic and obtain username and password that used to connect to an FTP server, it is also possible to know which data is saved to FTP server, or obtained from it.

Secure methods of communication include FTPS and SFTP. FTP protocol is obsolete nowadays it had been replaced with more secure alternatives. I don’t know if FTP protocol is still in use today. Maybe some legacy systems rely on FTP data transfer.

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