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 often found on larger sailing vessels, such as yachts and sailboats, making them suitable for long-distance cruising. The shape of a full keel allows for better tracking, meaning the boat can maintain a straight course more easily. This feature is particularly beneficial in strong winds and challenging sea conditions. Overall, full keels are favored for their balance of stability and performance in various maritime environments.