In binary system the highest value of a 8-bit number is
In binary system the highest value of a 8-bit number is 255.
8 bits is 11111111, or 255 in decimal notation.
A byte can hold 2 (binary) ^ 8 numbers ranging from 0 to 2^8-1 = 255.
A binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols: typically 0 (zero) and 1 (one).