Many different versions of the game exist around the world, but the most popular is tenpin bowling. You roll a bowling ball down a slick lane to knock down 10 pins, which are in a triangular arrangement facing you. On either side of the lane are gutters that will trap the ball if it veers too far to either side of the lane.
A set of 10 pins is known as a rack. A game is made up of 10 frames. The job of the pinsetter is to create each rack at the beginning of each frame, and clear away knocked-over pins so they do not get in the way. Most modern bowling facilities have computerized bowling lanes that display your score automatically throughout the game, and the electronics and sensors in the pinsetter also help keep track of the score.
Now let's learn about the machine that sets up the pins after every roll.