A buoy at sea is a floating device used primarily for navigation, marking hazards, or indicating the location of important points such as channels, shipping lanes, or underwater structures. Buoys are typically made of durable materials like plastic or metal and are anchored to the seabed or floating freely depending on their purpose. They come in various shapes, sizes, and colors, each serving a specific function in maritime operations. Buoys may display lights, reflectors, or radar reflectors to enhance visibility during day and night, aiding ships and boats in safe navigation through waters. They play a crucial role in marine safety, helping to prevent collisions, guide vessels, and delineate restricted areas in oceans, seas, lakes, and rivers worldwide.