I love to play the racket sport, tennis! Have you ever had a singles or doubles match?
I never have but I always was very curious!
The players have rackets strung with a cord. They use a hallow ball made of rubber and hit it over a net. It's a fun gameQ
and that is played indoors right?
It can be played indoor or outdoors. The game has connections with other lawn games like croquet or bowling. 
oh okay cool! I would always go see my dad play but he never let me because it was fast paced
19th century, in fact, the term "tennis" referred to real tennis, not lawn tennis.
The rules of modern tennis have changed little since the 1890s. Two exceptions are that from 1908 to 1961 the server had to keep one foot on the ground at all times, and the adoption of the tiebreak in the 1970s. A recent addition to professional tennis has been the adoption of electronic review technology coupled with a point-challenge system, which allows a player to contest the line call of a point,
Tennis
Tennis is a racket sport that can be played individually against a single opponent (singles) or between two teams of two players each (doubles). Each player uses a tennis racket that is strung with cord to strike a hollow rubber ball covered with felt over or around a net and into the opponent's court. The object of the game is to maneuver the ball in such a way that the opponent is not able to play a valid return. The player who is unable to return the ball will not