Because they depend on the place value of numbers.
For example, 101 = 1*b2 + 0*b + 1 where b is the base (2 or 10). There are only b different symbols or digits. Numbers that are greater than or equal to the base are displayed using the positional notation.
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That is called a "bit", short for "binary digit".
Bit
a repeating decimal
That is called a bite. * * * * * A byte.
one byte