Balls.com discusses the rules that govern balls used in many sports around the world. We provide an index of sports that require balls in order to play. For each of these sports, we have researched the rules that govern the size, shape, color, weight, constructions, markings, pressure and other characteristics of the balls. Many of the sports have governing bodies that set these rules – sometimes for very specific levels of play. For example, the basketballs used at the high school level are different than the basketballs used in the NBA. We try to provide information for different levels of play. Other sports are more relaxed and do not have separate rules for different levels of play. From our research, you will learn of balls used in sports played indoors, balls used in sports played outdoors and balls used in sports that can be played in both. Some of the sports are better known as recreational games, while others are viewed as competitive. Over time, we hope to expand our categories to include interesting facts about balls.