Baseball is a team sport that originated in the United States. It involves two teams of nine players each who take turns batting and fielding. The goal is to score more runs than the opposing team by hitting a thrown ball and running around four bases. The document provides a brief history of baseball and its evolution from ancient stick and ball games. It outlines the basic rules and objectives of gameplay, as well as introducing famous baseball stars like Joe DiMaggio and Frank Robinson. Important baseball stadiums and the major professional leagues are also mentioned.