McDonald's began as a hamburger restaurant and rapidly expanded after Ray Kroc purchased it in 1952, becoming the world's largest restaurant chain with approximately 68 million customers daily. Over the years, McDonald's faced challenges in maintaining its core values of quality, cleanliness, service, and value, particularly during rapid growth in the late 1900s and early 2000s. Currently, the company focuses on revitalizing its brand through smart marketing, community engagement, and adapting to customer preferences.