Binary

Binary is a base 2 number system. It is called base 2 because there are only 2 digits: 0 and 1. Decimal also has the digits 0 and 1, so a subscript "(2)" is usually added to binary numbers to not confuse people.

Computers work in binary, because it is the simplest way to store information using electricity. A wire can be powered on to represent a 1, or powered off to represent a 0. Large sets of binary numbers can be used by computers to represent other types of information, such as text, songs, or videos.