Drain plugs are small devices used to seal the openings of drains, preventing water or other liquids from escaping. They are commonly found in sinks, bathtubs, and other plumbing fixtures. Drain plugs can be made from various materials, including rubber, plastic, or metal, and come in different shapes and sizes to fit specific drain openings. When a drain plug is inserted into a drain, it creates a watertight seal. This allows users to fill sinks or tubs with water for bathing or washing. Some drain plugs are designed to be removable, while others may be permanently fixed in place, depending on the design of the fixture and the needs of the user.