Binary Number: A binary number is a positional numeral system with two as the base. The binary number system consists of two different numerals, namely zero and one. These can be used to represent all other numbers. As it has the advantages of easy implementation by logic gates, it is mostly used in electronic and computer-based devices.
In a simple way, write down the numbers from right to left: 1,2,4,8,16,32,64 and 128. Binary one is 000001. (write this above or below the other numbers I just gave you) The number two is 000010.