Spin balls are specialized sports balls designed to enhance the spin effect during play. They are commonly used in games like table tennis and tennis, where the ability to impart spin can significantly affect the trajectory and bounce of the ball. The surface texture and weight distribution of spin balls are engineered to optimize their performance. In table tennis, for example, players use spin balls to create challenging shots that can confuse opponents. The spin can make the ball curve or dip unexpectedly, making it harder to return. Understanding how to use and respond to spin balls is crucial for success in these sports.