Mod 10, also known as the modulo 10 system, is a mathematical operation that finds the remainder when one number is divided by 10. This system is commonly used in various applications, such as calculating checksums for credit card numbers and other identification numbers. The result of the Mod 10 operation is always a single digit, ranging from 0 to 9. In practical terms, Mod 10 helps in error detection. For example, if a number is processed using the Mod 10 algorithm, any errors in data entry can often be identified by checking if the final digit matches the expected result. This method is widely used in systems like ISBN and UPC codes to ensure accuracy.