How was the internet first invented without the internet?

Question

How was the internet first invented without the internet?

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Answer 1

it started with a few computers in the same building, then several buildings on same campus, then buildings in same city (connected periodically via phone lines with modem devices).

even before internet and PC’s, they had “mainframe” computers than had multiple terminals in potentially different locations, which functioned like computers connected to a central server, so the concept was not completely new.