A "drain" is a system or device that removes excess water or liquid from an area. It can be found in various places, such as sinks, bathtubs, and roads, helping to prevent flooding and maintain cleanliness. Drains work by directing water away from surfaces and into a sewer system or other disposal areas. There are different types of drains, including storm drains, which collect rainwater, and sewage drains, which carry wastewater. Proper maintenance of drains is essential to ensure they function effectively and to avoid blockages that can lead to unpleasant odors or water damage.