How to use SSH for secure connections in macOS

Before personal computers, people used time-sharing terminals in computer labs which were attached to mainframe computers. Each user sat at a dumb terminal which was merely a display and keyboard connected to the mainframe computer. Later, as mini computers began to arrive, terminals were connected via a network.Originally, to access another computer on a network remotely a program called Telnet was used. Telnet was one of the earliest internet applications, and was widely used in university and research settings. Security wasn't considered an issue at the time, since most people still didn't use the internet, and mass online fraud wasn't a problem.

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