The mechanism works in the following way: A user inputs a character, which is transmitted, for example, through the use of a modem to modulate a tone of audio, to the remote destination.
It was in the 1950s that the internet originated, and this can be traced back to the USA of those days. In the late Cold War, as tensions between North America and the Soviet Union reached their peak, a war of attrition emerged between them, which eventually led to the end of the Cold War.
As a result, the US realized that it needed a communication system that would be immune from a Soviet nuclear attack that could affect its operations.
When these computers were first invented, military scientists and university employees were the only ones who could afford these large, expensive devices.
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