A burial vault is a protective container placed around a casket in a grave. Its primary purpose is to prevent the ground from collapsing over time and to protect the casket from water, soil, and other elements. Burial vaults are often made of concrete, metal, or plastic and can vary in design and cost. Many cemeteries require burial vaults to maintain the integrity of the burial site. They help ensure that the grave remains stable and can accommodate the weight of the earth above. This practice is common in many cultures and is often associated with traditional burial methods.