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 gain a point, while the opposite player will.
!!---------- Android Setting -----------!!
To install apps that are not from the Google Play Store; Android requires you to enable the (Unknown Sources Setting).
To enable the Unknown Sources setting:
Go to your Home screen and tap Settings. Select Security. You may need to scroll down to see the Unknown Sources setting, enable this setting then try installing the application again. For Android 8.0+, tap Settings, then tap Apps. Next search for the app you just downloaded and enable it to be installed. If you still have problems try searching online for how to turn on >>> (Enable Unknown Sources) for Android.