Walmart is an American multinational retail corporation that operates chains of hypermarkets, discount department stores, and grocery stores. Sam Walton founded the first Walmart store in Rogers, Arkansas in 1962. Walmart is now the world's largest company by revenue and the largest private employer in the world. It operates through three main segments: Walmart US, Walmart International, and Sam's Club. Key competitors include Target, Dollar General, Tesco, Metro AG, and Amazon. Walmart uses a variety of marketing strategies to offer low prices on a wide range of products and services.