Parity Bit

- Parity Bit is a bit added to the end of string of binary code.

- Indicates whether the number of bits in the string with the value one is even or odd.

7 bits of data	(count of 1 bits)	8 bits including parity
		even	odd
0000000	0	00000000	00000001
1010001	3	10100011	10100010
1101001	4	11010010	11010011
1111111	7	11111111	11111110

- Parity bits are used as the simplest form of error detecting code.

There are two variants of parity bits:

1.Even parity bit.

2.Odd parity bit.

In even parity, occurrences of bits whose values is 1 is counted.

- If the count is odd, the parity bit value is set to 1, making 1 bit's count to even.

- If the count is even, the parity bit value remains 0.

In odd parity, the situation is reversed.

- If the count is even, the parity bit value is set to 1.

- If the count is odd, so its already odd and parity bit remains 0.