Concrete forms, also known as formwork or shuttering, are temporary structures or molds used to contain and shape freshly poured concrete until it sets and becomes self-supporting. They provide the necessary support and shape to the concrete during the curing process. Concrete forms can be custom-built on-site using lumber, plywood, or other materials, or they can be prefabricated and assembled according to specific project requirements. They need to be properly designed and securely anchored to resist the pressure exerted by the wet concrete. Once the concrete has cured and gained sufficient strength, the forms are removed, leaving behind the desired concrete structure.