Burger King is one of the largest hamburger restaurant chains in the world that has been operational since 1954. The chain operates more than 11,000 restaurants in the United States and over 50 other countries. Most of its restaurants are operated by independent franchisees and are family-owned. The chain s restaurants serve a variety of food items that includes flame-broiled burgers, onion rings, chicken sandwiches, desserts, salads and beverages. Its restaurants menus also feature BK Stackers, BK VEGGIE burgers, BK JOE coffee, ICEE drinks and CHICK N CRISP sandwiches. The chain additionally offers a prepaid card, BK CROWN CARD. Nearly 11 million guests visit BURGER KING restaurants worldwide each day.