256 (number) - Wikipedia
https://en.wikipedia.org/wiki/256_(number)
256 (two hundred [and] fifty-six) is the natural number following 255 and preceding 257. 256 is a composite number, with the factorization 256 = 28, which makes it a power of two.
The Story of 256
https://256stuff.com/256.html
Byte == 256. So that's it. A byte is a unit of storage in a computer which contains 8-bits and can store 256 different values: 0 to 255.