binary

Any scheme that uses two different states, components, conditions, or conclusions.

In mathematics, the binary or base-2 numbering system uses combinations of the digits 0 and 1 to represent all values. The more familiar decimal system has a base of 10 (0-9).

Unlike computers, people find binary numbers that consist of long strings of zeros and ones difficult to read, so most programmers use hexadecimal (base-16) or octal (base-8) numbers instead.

Binary also refers to an executable file containing a program.