"Close-hauled" is a sailing term that describes a boat sailing as directly into the wind as possible. When a sailboat is close-hauled, its sails are trimmed in tightly, allowing the boat to move forward while maintaining a course that is typically about 30 to 45 degrees off the wind direction. This position maximizes the boat's speed and efficiency when sailing upwind. In this sailing maneuver, the boat uses the aerodynamic lift generated by the sails to propel itself forward. The keel or centerboard helps to counteract the sideways force of the wind, allowing the boat to maintain its course. Close-hauled sailing is essential for navigating toward a destination that lies upwind.