A bit can either be full or empty: if it is full, it is called "1," and if it is empty, "0." Because there are two options, computers are said to use the "binary system" consisting of two numbers, the 1 and the 0.
Example
A group of bits that a computer uses might look like this: 1011000011010111100.
Tomorrow: Byte
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Tomorrow: Byte
Hint: click on the word "Byte" above to go directly to the "Byte" page.