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A long time ago, after ways to make semiconductors were discovered - around 1955 - circuits were made by using a separate transistor to perform each function. That took a lot of real estate on a circuit board and meant severely decreased functionality when handling high frequencies.

Nowadays all of those transistors and their associated circuit components can be laid out and etched into an area that is less than the size of the point of a pin, which is why they are called INTEGRATED CIRCUITS.

The material that is used is a wafer of specially-prepared semiconductor material that has been doped differently in various nano-layers to allow the various circuit elements to be formed by selective etching.

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Q: What are integrated circuits are and why are they used?
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