FTPS (also known as FTP-SSL and FTP Secure) is an extension to the commonly used File Transfer Protocol (FTP) that adds support for the Transport Layer Security (TLS) and, formerly, the Secure Sockets Layer (SSL, which is now prohibited by RFC7568) cryptographic protocols.

FTPS (FTP/SSL) is a name used to provide a number of ways that FTP software can perform secure file transfers. Each way involves the use of a SSL/TLS layer below the standard FTP protocol to encrypt the control and/or data channels.

File Transfer Protocol Secure (FTPS) is a secure file transfer protocol based on File Transfer Protocol (FTP). It was created as a substitute for FTP, which sends usernames, passwords and data in plaintext. That means anyone can intercept, read or sell confidential information sent with FTP.

At its core, FTPS (FTP over SSL) is a secure file transfer protocol that allows you to connect securely with your trading partners, customers, and users. When file transfers are sent, they are exchanged using FTPS and can be authenticated through FTPS-supported methods like passwords, client certificates, and server certificates.