Computer Science for IGCSE & O level - Data Transmission (Section 9 - No. 13)

What is the purpose of the extra bit added in a parity check?

To store the data

To indicate the length of the data

To ensure that the total number of '1' bits is always even or odd

To encrypt the data

The parity bit makes the total number of 1s in each group (byte, block, etc.) either even or odd, as defined by the parity scheme used.