Walmart, founded by Sam Walton in 1962, is the largest global corporation by revenue and operates in 28 countries, providing a diverse range of products aimed at modest-income shoppers. The company has a strong market presence, focuses on everyday low prices, and uses a decentralized operational strategy while facing intense competition and various risks in international markets. Walmart's mission is to help people save money for a better life, supported by a robust supply chain and continuous expansion efforts.