A bouncy ball is a small, round toy made from rubber or a similar elastic material. When dropped, it can bounce back to a significant height due to its ability to compress and then expand quickly. The energy from the fall is stored in the ball's material and released when it hits the ground, allowing it to rebound. Bouncy balls come in various sizes, colors, and designs, making them popular among children and adults alike. They are often used in games, sports, or simply for fun. The physics behind their bounce involves concepts like energy, gravity, and elasticity.