Binary is the simplest numbering system, as digits are limited to only two possible symbols, (0 & 1).
A binary digit is given a special name, it is called a bit.
Quantities greater than one, are written using two or more bits.
Like decimal the bits have different weightings, but in binary the weightings increase by a factor of 2, moving from right to left.
The symbol 1, in each of the above example represents:
The left hand bit in a binary number has the greatest weighting and is called the most significant bit (m.s.b.). The right hand bit in a binary number has the lowest weighting and is called the least significant bit (l.s.b.).