Parity bit check is used to

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URSC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 20 Nov 2016)

Answer 1

Parity bit check uses parity bit to check errors in digital data transmission.
A parity bit is added to every data unit (normally 7 or 8 bits) transmitted such that the total parity (total number of ‘1’s) is odd or even.
At the receiver the parity of the received bit is checked if it is the same as the parity of transmitted bits then there is no error.
However, this method is not used to calculate a 2-bit error since the change in two bits will again give the same parity (odd or even as decided at transmission).