A centerboard is a retractable keel found on some sailboats, designed to improve stability and performance while sailing. It is typically a flat, vertical board that can be lowered into the water to provide lateral resistance against the wind, helping to prevent the boat from drifting sideways. When not in use, the centerboard can be raised into the hull, allowing for easier navigation in shallow waters. Centerboards are commonly used in smaller sailing vessels, such as dinghies and catamarans. They offer advantages over fixed keels, including reduced draft and increased maneuverability. This makes them popular among recreational sailors and those who often sail in varying water depths.