The primary function of a lighthouse is to serve as a navigational aid for maritime vessels. Lighthouses emit light and often sound signals to alert ships of nearby hazards, such as rocky coastlines, shallow waters, or dangerous currents. By marking coastlines and entrances to harbors, they enhance the safety of navigation, helping prevent accidents at sea. Lighthouses also serve as reference points for pilots, allowing them to determine their position along the coast. Each lighthouse has distinct characteristics, such as light color and pattern, making them recognizable to those navigating the waters.