Shopify POS is our point-of-sale system, which allows merchants to sell their products in person. The POS can be used by merchants who have their own brick-and-mortar stores, but also by those who only sell in person on occasion (such as at trade fairs or pop up shops). There is no requirement for Shopify merchants to use the POS if their interest is instead in online selling.
If you have any other questions about Shopify POS or the Shopify platform as a whole, please let me know.
Victor | Shopify Social Care