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 ...

Parity checking adds an extra parity cell to each 8-bit byte of memory, thus creating a nine-bit structure. In an "even parity" system, a 0 is stored in the parity bit if there is an even number ...