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# Byte
Byte (symbol: B) is a basic unit of [information](information.md), nowadays practically always consisting of 8 [bits](bit.md) (in which case it is also called an **octet**), which allow it to store 2^8 = 256 distinct values (for example a number in range 0 to 255). It is usually the smallest unit of memory a [CPU](cpu.md) is able to operate on, and memory addresses are assigned by one byte steps. We use bytes to measure the size of [memory](memory.md) and derive higher memory [units](memory_units.md) from it, such as a kilobyte (kB, 1000 bytes), kibibyte (KiB, 1024 bytes), megabyte (MB, 10^6 bytes) etc. In [programming](programming.md) a one byte [variable](variable.md) is nowadays seen as very small and used if we are really limited by memory constraints (e.g. [embdedded](embedded.md)) or to mimic older 8bit computers ("[retro](retro.md) games" etc.): one byte can be used to store very small numbers (while in mainstream processors numbers nowadays mostly have 4 or 8 bytes), text characters ([ASCII](ascii.md), ...), very primitive colors (see [RGB332](rgb332.md), [palettes](palette.md), ...) etc.
Byte (symbol: B) is a basic unit of [information](information.md), nowadays practically always consisting of 8 [bits](bit.md) (in which case it is also called an **octet**), which allow it to store 2^8 = 256 distinct values (for example a number in range 0 to 255). It is usually the smallest unit of memory a [CPU](cpu.md) is able to operate on, and memory addresses are assigned by one byte steps. We use bytes to measure the size of [memory](memory.md) and derive higher memory [units](memory_units.md) from it, such as a kilobyte (kB, 1000 bytes), kibibyte (KiB, 1024 bytes), megabyte (MB, 10^6 bytes) etc. In [programming](programming.md) a one byte [variable](variable.md) is nowadays seen as very small and used if we are really limited by memory constraints (e.g. [embedded](embedded.md)) or to mimic older 8bit computers ("[retro](retro.md) games" etc.): one byte can be used to store very small numbers (while in mainstream processors numbers nowadays mostly have 4 or 8 bytes), text characters ([ASCII](ascii.md), ...), very primitive colors (see [RGB332](rgb332.md), [palettes](palette.md), ...) etc.
Historically *byte* was used to stand for the basic addressable unit of memory that could store one text character or another "basic value" and could therefore have a different size than 8 bits: e.g. ASCII machines might have had a 7bit byte, 16bit machines a 16bit byte etc.; in [C](c.md) (standard 99) `char` is the "byte" data type, its byte size is always 1 (`sizeof(char) == 1`), though its number of bits (`CHAR_BIT`) can be greater or equal to 8; if you need an exact 8bit byte use types such as `int8_t` and `uint8_t` from the standard `stdint` library. From now on we will implicitly talk about 8bit bytes.