In an "even parity" system, a 0 is stored in the parity bit if there is an even number of bits in the byte; if an odd number, a 1 is stored to make the total number of bits even. In "odd parity ...

Not using a parity bit to check for errors. For example, an 8-N-1 setting in a communications program, which was widely used before the Web, means each character transmitted contains (8 ...