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The term 'Secure Shell' directly correlates with the SSH protocol, which is designed to securely access network services over an unsecured network. SSH provides a secure channel over an insecure network in a client-server architecture, enabling encrypted communication that protects against eavesdropping, connection hijacking, and other potential threats.

SSH is widely used for secure remote logins, file transfers, and executing commands on remote systems, making it an essential tool in the realm of system administration and security. The significance of SSH lies in its strong encryption mechanism, which ensures that data transmitted between the client and server is confidential and intact.

In contrast, the other mentioned protocols serve different purposes: FTP is used for file transfers without encryption, Telnet is used for unencrypted remote shell access, and SMTP is a protocol for sending email. None of these protocols provide the same level of security and encryption as SSH, making it clear why SSH is the correct choice when discussing 'Secure Shell.'