When you have a physical store and you can sell your goods with your Point of Sale without giving your sales staff access to the back-end.
All products/orders/calculation rules/customers will be synchronized into the POS. In this manner, your software store inventory will be synchronized with stock at physical store.
Cashier can choose from different available variants.
Admin can generate Barcode of products from "POS Products" admin panel and can print barcode label. Casher can add product using barcode reader.