What does the "S" at the end of FTPS indicate?

The "S" at the end of FTPS stands for "Secure." FTPS is an extension of the File Transfer Protocol (FTP) that adds support for the Transport Layer Security (TLS) and the Secure Sockets Layer (SSL) cryptographic protocols. By incorporating these encryption protocols, FTPS secures the data being transferred over the network, protecting it from eavesdropping and tampering during the communication process. The primary purpose of FTPS is to provide a safe and secure method for transferring files, ensuring that both the control messages and the data connections are securely encrypted.