Racking pool balls is the process of arranging them in a specific pattern on the pool table before the start of a game. The most common racking pattern is the triangle rack, in which the balls are arranged in a triangle shape with the apex ball at the foot spot and the other balls arranged in rows behind it.
Racking pool balls correctly is important for several reasons. First, it ensures that the balls are evenly distributed on the table, which makes for a fairer game. Second, it helps to prevent the balls from scattering too widely when they are broken, which can make it difficult to play the game. Third, a well-racked triangle can help to give the player who breaks the balls a slight advantage, as it can make it easier to pocket a ball on the break.