The abbreviation SFTP is used for both the Simple File Transfer Protocol, a simple, low-function transfer protocol that dates back to 1984, and the Secure Shell
secured FTP protocol, SSH File Transfer Protocol. SSH File Transfer Protocol (SFTP) is a secure file transfer protocol, and Secure File Transfer Protocol and Secure FTP are the most widely used transfer techniques for secure file transfer. The SFTP protocol is an evolution of the FTP protocol that transfers control and user data in an unsecured manner. Like the Secure Copy Protocol (SCP), which has been largely superseded by SFTP, the SFTP protocol uses an encrypted connection
via Secure Shell (SSH2), which serves as the transmission basis for the SFTP protocol.
.servers or FTP clients and SFTP servers. However, there is client and server software that overrides these limitations. In the Apple world, the corresponding SFTP protocol is called Fetch (V.5) and works under Mac OS X.