TLS is universally deployable because it doesn’t rely on specific operating systems or applications. Accordingly, a variety of TLS-secured versions are available for various user protocols. The naming scheme is simple: the name of the protocol concludes on the letter “s” if the protocol communicates via TLS.
The most important area of application for TLS is the World Wide Web, or more accurately, the HTTP protocol. The encrypted version is called HTTPS.
Other frequent fields of application include:
- POP3S: collect e-mails from a server using the POP3 protocol
- IMAPS: synchronize inbox with server using the IMAP protocol
- SMTPS: send e-mails
- FTPS: file transfer via FTP protocol
- SIPS: Voice-over-IP calls via the SIP protocol
- IRCS: encrypted chats
OpenVPN, which is a free software for Virtual Private Networks (VPN), also uses a TLS protocol.