Walmart was founded in 1962 in Arkansas by Sam Walton. It is now the largest company in the world by revenue, operating over 11,000 stores across 28 countries. Walmart employs over 2 million people worldwide and had revenue of $485.9 billion in 2017. Its business strategy involves achieving cost leadership through large scale operations and supply chain efficiency while also differentiating itself through its own private label brands. However, Walmart faces challenges from competitors like Amazon and must continue adapting to changes in customer behavior and the retail environment through digital transformation and other initiatives.