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SSH (Secure Shell) is a network protocol that enables secure communication between two devices, often used to access remote servers as well as to transfer files or execute commands.SSH was originally developed by Tatu Ylonen in 1995 to replace Telnet, a network protocol that allowed users to connect to remote computers, most often to test connectivity or to remotely administer a server. This was necessary because Telnet was not secured or encrypted in any way. Today,