Barcodes are now in general use as a way of tracking all sorts of objects. They are quite reliable and have been in general use for over two decades. Any barcode system will of course, require  barcode tracking software  as well as corresponding hardware. Barcode tracking software is very often used for inventory control and for helping keep track of all sorts of items such as packages sent through couriers. The use of barcode systems has eliminated much of the possibilities for human error that could occur during data entry and counting that were an ever-present risk with old pen and paper systems. The systems are quite easy to use and can significantly reduce the possibilities for errors.