This document discusses curing and its methods for concrete. Curing refers to keeping concrete surfaces moist in order to preserve its properties and prevent moisture loss through evaporation. Several curing methods are described, including coating the surface with bitumen or waterproofing compound, covering with waterproof paper or layers of wet sand/clay/gunny bags, and membrane or ponding curing. Curing allows necessary chemical reactions to occur and strength to develop over 3 weeks, so concrete should be kept wet during this period.