Computers use transistors to do most of their storage and processing of data. A modern computer has billions of transistors in it. Transistors are a simple circuit element that can be put into one of two states: we refer to those states as high or low, on or off, 0 or 1. While it’s possible to construct a computer using circuit elements that can be put into more than 2 states, it’s far less efficient and far more expensive to do so, and it doesn’t really make the computer any better.
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