Water beads, also known as gel beads or water crystal gel, are small spherical gels that absorb and contain a large amount of water. They are usually composed of a water-absorbing superabsorbent polymer such as polyacrylamide. Water beads can be used for various purposes, including:

• Supplying water to small animals as an alternative to supplying water in a dish, as some small animals tend to fall into dishes of water and drown.
• Watering or potting plants.
• In vases of cut flowers.
• Use in gardens to save water.
• Used as ammunition for gel blaster toy guns.
• Colorful decorations or artificial snow.
• In a dry state as absorbent filler inside disposable diapers and sanitary napkins.
• Proposed for controlling or containing floods.

However, it is important to note that water beads can be dangerous if ingested or inserted into the body. They are often sold as toys, in craft kits, or as sensory tools for children with developmental disabilities. When water beads are exposed to water, they can grow up to 100-1500 times their original size, making them a choking hazard for young children. Ingested water beads can continue to grow inside the body, causing severe discomfort, vomiting, dehydration, intestinal blockages, and life-threatening injuries. Water beads inserted into ears can damage ear structures, causing hearing loss and requiring surgery. Therefore, it is recommended to keep water beads out of reach from toddlers or anyone under the age of five. If ingested, medical attention should be sought immediately.