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# Binary
The word binary in general refers to having [two](two.md) choices or "two of a thing"; in [computer science](compsci.md) binary refers to the base 2 numeral system, i.e. a system of writing numbers with only two symbols, usually [1](one.md)s and [0](zero.md)s, which are commonly interpreted *true* vs *false*. We can write any [number](number.md) in binary just as we can with our everyday [decimal](decimal.md) system (which uses ten digits, as opposed to two), but binary is more convenient for [computers](computer.md) because this system is easy to implement in [electronics](electronics.md) (a switch can be on or off, i.e. 1 or 0; systems with more digits were tried but unsuccessful, they failed miserably in reliability -- see e.g. [ternary](ternary.md) computers). The word *binary* is also by extension used for non-textual computer [files](file.md) such as native [executable](executable.md) programs or asset files for games.
The word binary in general refers to having [two](two.md) choices or "two of a thing"; in [computer science](compsci.md) binary refers to the base 2 numeral system, i.e. a system of writing [numbers](number.md) with only two symbols, usually [1](one.md)s and [0](zero.md)s, which are commonly interpreted *true* vs *false*. We can write any [number](number.md) in binary just as we can with our everyday [decimal](decimal.md) system (which uses ten digits, as opposed to two), but binary is more convenient for [computers](computer.md) because this system is easy to implement in [electronics](electronics.md) (a switch can be on or off, i.e. 1 or 0; systems with more digits were tried but unsuccessful, they failed miserably in reliability -- see e.g. [ternary](ternary.md) computers). The word *binary* is also by extension used for non-textual computer [files](file.md) such as native [executable](executable.md) programs or asset files for games.
One binary digit (a "place" for binary value in computer memory) can be used to store exactly 1 [bit](bit.md) of [information](information.md). We mostly use binary digits in two ways: