Barcode cards are a reference number and has ID data encoded in it, and that data is used by a computer to look up all specific information associated with the data. Bar code scanners are used for reading bar codes. They scan the bar code, decode the information and transmit it typically to a computer. Based upon scanning technology the scanners can be classified as CCD (Charged Couple Device) and Laser scanners. From application point of view, the scanners can be classified as Hand Held Scanners, Fixed Mount, Flatbed and Cordless scanners. Barcode cards has applications in loyalty in programs also.