Binary numbers: counting with 0 and 1
A computer counts with only 0 and 1, like a lamp that is off or on. With enough of those bits you can write any number.
You can start right here: you do not need any prior knowledge.
Why
A computer does not have ten fingers. So how can it count to 255, or to a billion?
Inside a computer there are tiny switches. A switch has only two positions: current or no current, on or off. We write that as 1 and 0.
With one switch you can only count to 1. But with eight switches side by side you can already make 256 different numbers. You will see how in a moment.
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