Accuracy is one of the hardest abilities in baseball. The reason for this is mainly for pitcher and catchers to keep the runners from stealing bases, also preventing hitters to get on base. It is all about placement of the ball. Depending on the batter, it determines where the ball should be placed (thrown). Every batter has a different preference on where they like the ball to be placed. Seen as their sweet spot in the box, meaning the area of the strike zone where he is most likely to get a hit with. If the pitcher is aware of where the batters weak spots are at the plate, they will try to put it in that spot the majority of the pitches given to them. This makes it so it prevents the runner getting on base or even extra bases. Accuracy is used to prevent any possible outcome given to the opposing team. That is basically the objective of the game, and that is why accuracy is so important. If you are a pitcher and you are unable to throw it where the catcher calls it, then you aren't seen as a true pitcher but only a just a thrower.