Pool aids are items used to help people play pool, such as cues, balls, and racks. Cues are the most important of these aids, as they are used to strike the balls and pocket them. Cues come in a variety of sizes and materials, and can be used for different types of shots. They are also used to control the speed and direction of the balls. Balls come in a variety of sizes and colors, and are used to pocket the balls into the pockets. Racks are used to arrange the balls in a triangle formation before the game begins.