Traditional barcodes are also known as one dimensional barcodes. There are several varieties, including UPC and EAN in common use. Most look similar to this:
These 1D barcodes contain a unique code which typically describes a product, like a CD or a book. You can look this code up on the internet to find prices, reviews, and more.
If you scan a book, you can also search the contents of the book for a word or phrase, and find all the pages where it appears:
