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Bowling refers to a series of sports or leisure activities in which a player rolls or throws a bowling ball down a lane. In indoor bowling, the target is usually to knock over pins. In outdoor variations, the aim is usually to get the ball as close to a target ball as possible. The indoor version of bowling is often played on a flat wooden or other synthetic surface, while outdoor bowling the surface may be grass, gravel or a synthetic surface.[1] The most common types of indoor bowling include ten-pin, nine-pin, candlepin, duckpin and five-pin bowling, while in outdoor bowling, bowls, bocce, pétanque and boules are popular. Today, the sport of bowling is enjoyed by 95 million people in more than 90 countries worldwide.

Ball Release

There are typically two different ways to roll a ball down the lane.
Straight
Beginners commonly just bowl the ball straight down the lane, hoping to hit the 1 and 2 pocket or the 1 and 3 pocket. When bowling straight like this, people often hold the ball with their hand in a "W" shaped form.Hook/Curve
The hook or curve ball is commonly used by more advanced players. As the bowler releases the ball, the ball starts out straight and then "hooks" because of the rotation the bowler puts on the ball during release. When curving, most people use two fingers and a thumb.
Delivery Styles

There are three different types of styles used when releasing the ball onto the lane. The three styles are the stroker, cranker and tweener styles.
Stroker
People who use the stroker style usually keep their feet square to the foul line. Stroking lessens the ball's spin rate and therefore decreases its hook/curve potential and hitting power. Strokers use finesse and accuracy.Cranker
Crankers try to create as much spin as possible by using a cupped wrist. Bowlers that use the cranking method often cup their wrist, but open the wrist at the top of the swing. Crankers often use late timing, meaning the foot reaches the foul line before the ball