Waiting staff (BrE), waiters / waitresses, or servers (AmE) are those who work at a restaurant, a diner, or a bar and sometimes in private homes, attending to customers by supplying them with food and drink as requested. Waiting staff follow rules and guidelines determined by the manager. Waiting staff carry out many different tasks, such as taking orders, food-running, polishing dishes and silverware, helping bus tables, entertaining patrons, restocking working stations with needed supplies, and handing out the bill.

A diner is a type of restaurant found across the United States and Canada, as well as parts of Western Europe. Diners offer a wide range of foods, mostly American cuisine, a casual atmosphere, and, characteristically, a combination of booths served by a waitstaff and a long sit-down counter with direct service, in the smallest simply by a cook. Many diners have extended hours, and some along highways and areas with significant shift work stay open for 24 hours.