Fast food restaurants emphasize speed of service. Operations range from small-scale street vendors with food carts to multi-billion dollar corporations like McDonald's and Pizza Hut. If table seating is available, ordering is not done from the table but from a front counter. Diners typically then carry their own food from the counter to a table of their choosing, and afterward dispose of any waste from their trays. Drive-through and take-out service may also be available. Fast food restaurants are known in the restaurant industry as QSRs or quick-service restaurants.