In a very very easy terms:
A semi-conductor is a wire that can conduct an electricity in one direction only. Imagine it like a gate, or a valve.
Now, it’s a very simple thing. But having few of them allows you to arrange them into an interesting layout, when you can make a controlled gate.
And from that you can arrange hundreds of those controlled gates into layouts to make simple memory cells or arithmetic machines.
And you can arrange hundreds and thousands of those small machines into CPUs and GPUs and microcontrollers.
[This](https://www.nandgame.com/) is a great game that goes over this process.
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