A printed label containing machine-readable data in the form of vertical bars of equal width but in whose variable heights are encoded the frequencies or values of the data represented. The data on the label can be read by an optical scanning device into an attached computer. In libraries barcodes are used to identify books for circulation and inventory, and to link a borrower's library card to the appropriate patron record in the library's computerized circulation system.
Want to learn more: Check out:
- The Original Barcode FAQ— from Azalea.com