Checks Bar Codes are a type of barcode that is used to verify the authenticity of a check. They are typically printed on the back of a check and contain information such as the bank account number, routing number, and check number. When a check is scanned, the information contained in the barcode is compared to the information on the check to ensure that it is valid. Scans are used to quickly and accurately process checks, making them an important part of the banking system.