McDonald's is the world's largest fast food chain founded in 1955. It operates over 36,000 locations worldwide using an operations management model focused on quality, service, cleanliness, value, and efficiency. McDonald's succeeds through strategic decisions around product design, supply chain management, and standardized yet adaptable operations processes. It aims to provide affordable and consistent products while minimizing waste and environmental impact through initiatives like recycling cooking oil and "green" restaurant design.