Sandcastle molds are tools used to create shapes and structures in sand, typically at the beach. They come in various designs, such as buckets, castles, and animals, allowing builders to easily form intricate details. Made from plastic or metal, these molds help retain the shape of wet sand, making it easier to construct impressive sandcastles. To use a sandcastle mold, you fill it with damp sand, pack it down firmly, and then lift it off to reveal the shape. This technique is popular among children and adults alike, enhancing the fun of building sand sculptures while ensuring consistent results.