Water beads are small, colorful spheres made from a superabsorbent polymer called sodium polyacrylate. When placed in water, they can absorb and retain large amounts of liquid, expanding to many times their original size. These beads are often used in gardening to help retain moisture in soil, as well as in decorative arrangements for events. In addition to their practical uses, water beads are popular in sensory play for children. They provide a unique tactile experience, as they are smooth and squishy. However, it's important to supervise young children, as the beads can pose a choking hazard if swallowed.