McDonald's is the world's largest fast-food chain, founded in 1940 and currently serving over 68 million customers daily across 121 countries with more than 36,250 outlets. The company has a significant market share and employs over 447,000 people, with a focus on demographic, psychographic, and behavioral segmentation in its marketing strategy. It is known for its burgers and fries and utilizes various promotional channels to communicate with its customers.