Define quick service restaurant related to food and beverage sector of a hospitality industry.

A quick service restaurant (QSR) is a type of eatery in the food and beverage sector of the hospitality industry that offers fast, convenient, and affordable meals. These establishments typically have a limited menu, counter service, and a focus on efficiency to serve customers quickly. Examples of QSRs include fast food chains like McDonald's, Subway, and Taco Bell.