Tennis is a game played between either two players ("singles") or two teams of two players ("doubles"). Players use a stringed racquet to strike a hollow rubber ball covered with felt over a net into the opponent's court. Tennis originated in England in the late 19th century and first spread through the English-speaking world, particularly among the upper classes. It is an Olympic sport that is played by all levels of society, all ages, and in most countries around the world. With the one exception being the adoption of the tiebreaker in the 1970s, its major rules have remained remarkably unchanged since the 1890s. Tennis is now followed by millions of people as a spectator sport. Full Article on Wikipedia