[ganoushoreilly]

It's secure tunneled FTP. Functionally it performs the exact same way as ftp only it's not in clear text and you have better authentication options.

[yjftsjthsd-h]

No, that's FTPS. FTPS wraps FTP in TLS; SFTP is a protocol in the SSH protocol that can transfer files and that happens to implement an FTP-like interface.