A full keel is a type of boat hull design characterized by a long, deep keel that extends downward from the bottom of the boat. This design provides stability and helps the vessel resist rolling in rough waters. Full keels are commonly found on larger sailing vessels, as they enhance tracking and allow for better performance in various sea conditions. The full keel's shape also contributes to improved directional control, making it easier for sailors to navigate. While this design offers advantages in stability and safety, it can make the boat less maneuverable in tight spaces compared to other hull types, such as the fin keel.