Today, barcodes are anywhere as they are a way of writing that:
A barcode does not contain information about the item; it is a reference number that is stored in a corresponding database. One of the most common ways of using barcodes is for inventory tracking. With the portable data terminals, a warehouse employee can enter the type of transaction such as check-in, check out, restock, move, take out, and other, scan the item and enter the quantity. The new data is sent to the main inventory database, where the item's status and quantities are updated.
Hardware and software generate a powerful barcode tracking system by working together. Such a system can be used for finding information about products, tracking specific items location, counting inventory, updating information about the inventory levels, receiving inventory, picking items for customer orders, and others.