A barcode is a series of parallel black bars and white spaces, both of varying widths. Bars and spaces together are called elements. Different combinations of the bars and spaces represent different characters, such as numbers or letters. Each combination or sequence of bars and spaces is a code that can be translated into information such as price, product type, place of manufacture, or origin of shipment.

Barcodes are simple to use, accurate, and quick. Almost everyone is familiar with their use in retail establishments. They are also often used in ware-houses and manufacturing for selecting items from storage, receiving goods, and shipping.

The FDA requires that a product's national drug code be placed on the container label and outer wrapper on most prescription drugs and about 70 percent of over-the-counter drugs and on blood and blood components intended...