Which type of establishment is characterized by the sale of food and drink to customers?

The establishment characterized by the sale of food and drink to customers is a restaurant. Restaurants are specifically designed to serve meals, beverages, and often a variety of culinary experiences, catering to a range of tastes and dining preferences. This includes full-service dining with waitstaff, buffets, fast-casual options, and more.

Other types of establishments mentioned have distinct purposes. A café, while it does offer food and drink, is often more focused on lighter fare such as coffee, pastries, and snacks rather than full meals, and may not always meet the broader definition of a restaurant. A barbershop primarily provides grooming services, not food or beverages. Lastly, a retail store sells goods (e.g., clothing, electronics, etc.) rather than food and drink, so it does not fit the criteria of an establishment centered around dining. Therefore, the answer identifies the most inclusive category dedicated to food and beverage sales, which is the restaurant.