Binary is a way of
expressing numbers in ones (high voltage value) or zeros (low voltage value) – there is
nothing in between.
You can only have either a 1 or a 0.

In mathematical language
you are expressing numbers to the base 2 instead of our normal decimal system where we
use the base 10.

The number of digits in the group gives is the BIT NUMBER. All the numbers in the table below are FOUR BIT NUMBERS.

Many of your computers are 32 BIT machines – they deal with numbers like: