Check Digit, extra digit added to a number that is calculated from the existing digits in the number, Even parity check, checks to see that the total number of 1s in the byte is even, and sets the parity bit to 1 to make it an even number if not., Error detection, The process of finding if data has changed during transmission or storage., Data transmission, The process of sending data from one device to another., Parity bit, An extra bit added to data to detect errors in transmission., Error correction, The process of fixing errors found in transmitted data., ARQ (Automatic Repeat request), The computer asks for data to be sent again if an error is found., Check digit examples, Barcodes, ISBN, Echo check, A method of error detection where data is sent to the receiver and then the receiver sends it back to the sender, who compares the two versions to check for errors, Checksum, A value calculated from a block of data and sent with that block; on receipt the checksum is recalculated and compared to detect errors.

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