Reefing is a sailing technique used to reduce the area of a sail when wind conditions become too strong. This helps maintain control of the boat and prevents damage to the sails or rigging. Sailors can reef by folding or rolling part of the sail, making it smaller and easier to handle. There are different methods of reefing, including single-line reefing and jiffy reefing, which allow for quick adjustments while sailing. Proper reefing is essential for safety and performance, ensuring that the vessel remains stable and responsive in changing weather conditions.