A jib is a type of sail that is set in front of the main sail on a sailing vessel. It is typically triangular in shape and helps to catch the wind, providing additional propulsion. Jibs are commonly used on various types of boats, including sloops and catamarans, to improve maneuverability and speed. Jibs can be classified into different types, such as the genoa, which is larger and overlaps the main sail, and the staysail, which is smaller and used in specific wind conditions. Properly trimming the jib is essential for optimal sailing performance and efficiency.