Parity Bit
- Using a ( redundant ) bit to detect and correct a one-bit error
- E.g. count the number of bits that are 1, see if it's odd or even
- Parity is 0 if the number of 1 bits is odd
parity bit is 1 parity bit is 0 - Parity can detect a single error, but can't tell you which of the bits got flipped