Barcode cards is 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. There are 2D barcode scanners to scan 2D bar codes. 2D bar codes can store much more data than linear barcodes. Symbology is considered a language in bar code technology. When a bar code is scanned, it’s the symbology that enables the information to be read accurately. And then when the bar code is printed its the symbology that allows the printer to understand the information that needs to be turned into a label. Type of Symbology are Cod 39, Code 128, 2 of 5, 2D Barcode.