What exactly the term SSH(Secure Shell) means ?
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In the before time, long ago
In the time before computers, people had the idea of building really long typewriters, so you could push the keys in one building and a message would appear in another. They eventually made it work by using wires.
This technology was well-developed before computers, so once computers became powerful enough, the next idea was to use teletypewriters to talk to computers. People wired them together and invented computer languages.
Next they turned the wires into sounds that could be sent through phone calls (modems) and then packets over computer networks (telnet, etc.)
SSH is the most recent development. It uses asymmetric key cryptography so you can talk to a computer over a public packet switching network like the Internet. But it’s still like a data call which means it still can be used like a teletype using the same kind of human-computer languages that were developed in the 60s and 70s.
You can also send files, tunnel vpn connections, and even connect some kinds of GUI, but the teletype interface remains popular. SSH is frequently used to set up and troubleshoot servers, and talking to it is the most comfortable way to do that.
The cryptography part means every computer or user account has a pair of keys. The private key stays on the computer where it was generated and acts like a password. The public key is copied over to every system you need to connect to, and acts like a password-checker.
There are more complex options, but that’s the basic setup.
When you connect two computers they’re able to recognize each other and set up a tamper-proof connection that resists eavesdropping.
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