Tennis is a sport that is played on a court with a net between two or four players using tennis rackets to hit a ball back and forth. The document discusses the origins of tennis from ancient Greece and its reinvention and standardization in the late 1800s. It notes several benefits of tennis including a lifetime sport, exercise, and focus on the mind and body. Some negatives are that it can be costly and cause injuries if not played properly. Places to play tennis locally are also listed.