How is a check digit used to detect errors? - Answers

A check digit is a numeric value added to a data set, such as a barcode or identification number, to help verify the integrity of the information. It is calculated using a specific algorithm based on the other digits in the data set, allowing for the detection of common errors like single-digit mistakes or transpositions. When the data is processed, the system recalculates the check digit and compares it to the original; if they don’t match, an error is indicated. This simple mechanism enhances data accuracy and reliability in various applications.