Wikipedia
A parity bit, or check bit, is a bit added to a string of binary code to ensure that the total number of 1-bits in the string is even or odd. Parity bits are used as the simplest form of error detecting code.
There are two variants of parity bits: even parity bit and odd parity bit.
In the case of even parity, for a given set of bits, the occurrences of bits whose value is 1 …
Parity bit - Wikipedia, the free encyclopedia