What dose a barcode tell you?

Sourc:The SiteAddtime:2016/7/9 Click:0

At the beginning of a barcode, you will see a number which is a system characters and specific to an industry. For example zero is grocery and three is pharmaceutical. The price of a product itself is not encoded in the barcode, just the ability to look it up in the host system via the manufacturer and product code.
The barcode will contain a manufacturer code/company prefix which is from six to ten digits in length and is a globally unique prefix assigned to the company. This ensures that a product’s barcode is not confused with another company’s product.