Soft ball is a type of ball game that is played with a soft, lightweight ball. The two most common types of soft ball are Nerf and YARN. Nerf is a brand of foam-based balls that are used in a variety of sports and games. YARN is a type of string or cord made from natural or synthetic fibers. It is often used to make soft, lightweight balls for various sports and games. Both Nerf and YARN are popular choices for playing soft ball.