Sand molds are a type of casting used in metalworking and sculpture. They are created by packing sand around a pattern, which is usually made of metal or wood. Once the pattern is removed, the hollow space left behind is filled with molten metal to create a solid object. This method is popular because it is cost-effective and allows for intricate designs. The sand used in these molds is often mixed with a binding agent, such as clay, to improve its strength and durability. After the metal cools and solidifies, the sand mold is broken away, revealing the finished product. This technique is commonly used in industries like automotive and aerospace, as well as in art for creating sculptures.