McDonald's is the world's leading hamburger fast food chain, founded in 1940 and expanded globally since 1955 under Ray Kroc. It has over 34,000 restaurants in 119 countries, serving 70 million customers daily. McDonald's emphasized consistency, quality, service, cleanliness and value. It targeted children through Ronald McDonald and happy meals. While very successful, McDonald's faces risks from health concerns over obesity and changing tastes demanding healthier options. It has responded by adding healthier foods and emphasizing affordable prices, quality, and a good customer experience.