How does a parity bit in ASCII code help in error detection?

A parity bit in ASCII code provides a simple method for error detection by adding an extra bit to a binary representation of a character, ensuring that the total number of 1s in the byte is either even (even parity) or odd (odd parity). When data is transmitted, the receiving system checks the parity of the received bits against the expected parity. If there is a mismatch, it indicates that an error has occurred during transmission, allowing for the identification of potential data corruption. However, parity bits can only detect single-bit errors and cannot identify which bit is incorrect or handle more complex errors.