Supermarket
Today, most groceries stores are too big for one person to take care of.  Because of this, customers must find the items they wants by themselves.  Most often, the customer takes a shopping basket or shopping cart and put the items into the basket or cart.  For some items, like meat and seafood, the customer still has to have an employee get or prepare the item.  When customers have finished selecting, they bring the items to the "checkout", where a person called a cashier scans the customer's items into a cash register (or a computer as part of a point of sale system) and then takes the customer's payment.  Supermarkets typically accept payment by cash, debit cards, and/or credit cards.  In the 21st century, there are so-called self-checkout systems where customers scan the items themselves.