FTP General Data Communication and Transmission Modes
Once a data connection has been established between the server-DTP and the user-DTP, data is sent directly from the client to the server, or the server to the client, depending on the specific command issued. Since control information is sent using the distinct control channel, the entire data channel can be used for data communication. (These two logical channels are multiplexed at lower layers along with all other TCP and User Datagram Protocol (UDP) connections on both devices, so this doesn't actually represent a performance improvement over a single channel.)
FTP defines three different transmission modes (also called transfer modes) that specify exactly how data is sent from one device ...
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