United States Steel Corporation, commonly known as U.S. Steel, is an American integrated steel producer headquartered in Pittsburgh, Pennsylvania. Founded in 1901, it was one of the first billion-dollar corporations in the world. The company primarily manufactures steel products for various industries, including automotive, construction, and energy. U.S. Steel operates several steel mills and facilities across the United States and has a significant presence in the global steel market. The company is known for its commitment to sustainability and innovation, focusing on reducing environmental impact while meeting the demands of modern manufacturing.