1 and 0 is just how us humans represent what a computer sees. It comes from “On” and “Off” and evolved from the representation for closed and open circuits, | and O, or the same things you see one a lot of power switches. Early computers used a series of powered and non-powered circuits to perform their operations (they still do, only at a *much* smaller level and its through voltage differences instead of power/no power). Since most typewriters and printers of the age didn’t have the | symbol on them, printed media used 1 and 0. It’s just sort of stuck that way.
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