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A computer is considered digital because of the way that it stores information. The bit, which is a single "on" or "off" in a computer system, is a single digit. An example of a difference between digital and analogue is thus: If you have a voltage, from 0 to 5 volts, you could represent 2.5 volts in an analogue system as 2.5 volts. However, in a digital system, that voltage would need to be converted. The resolution refers to how many "steps" there are between 0 and 5 volts. Let's say that we were going to represent our voltage with 8 bits (or 8 on and off states). That gives us a potential for 256 combinations, with 0 being 0 volts, and 255 being 5 volts. Therefore, 2.5 volts would be represented by 128. That is a DIGITAL representation of an ANALOG value.

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Q: Why computer is digital not analog?
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