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What does the concept of an integrated circuit mean in electrical engineering?

The first computers took up the space of entire buildings, and their computing power was millions of times lower than that of today's cheap and small devices. This state of affairs was the result not only of the low efficiency of the components at that time, but also of the fact that one large element could handle only one task. The most important step towards miniaturization of electronic devices was the invention of the integrated circuit.