McDonald's has achieved great success since opening its first restaurant in 1955, growing to over 31,000 restaurants across 198 countries by 2007, due to policies focusing on quality, service, cleanliness and value. Their success is also attributed to extensive research before entering new markets, adopting local cultures, and providing amenities like play areas and drive-throughs, along with diverse menus, advertising, and promotions. Competitors include Burger King, KFC, Pizza Hut, and Wendy's.