Table tennis, or ping-pong, is a lively indoor game that resembles a miniature version of tennis. The players use rackets, which are often called paddles, to hit a ball back and forth over a net that stretches across a table. They score points by hitting the ball so their opponent or opponents cannot return it. Table tennis may be played by two or four persons. If two persons play, the game is called singles. If four play, the game is called doubles.