Jib

A triangular sail set ahead of the foremast, typically attached to a stay, and used to improve a vessel’s manoeuvrability and balance.

The jib is an essential sail on many sailing vessels, located forward of the mainmast and typically attached to a stay running from the bow or bowsprit to the top of the foremast. It is triangular in shape and plays a crucial role in balancing the sail plan, particularly when tacking or sailing close to the wind. Unlike the mainsail, which is attached to the boom and mast, the jib is free from such rigid attachments, allowing it to be more easily adjusted to different wind conditions. The jib helps to direct airflow across the mainsail, improving the overall efficiency of the sail plan and enabling the vessel to sail closer to the wind. 

On smaller vessels, the jib is often the first sail to be hoisted after the mainsail, and it can be furled or unfurled depending on the wind strength. On larger vessels, multiple jibs may be used, such as a genoa or a spinnaker, depending on the sailing conditions. The jib is particularly useful when manoeuvring, as it helps to steer the bow of the boat through the wind during a tack. It also contributes to the forward drive of the boat, especially when sailing upwind. Proper trimming of the jib is essential for maintaining speed and balance, making it a critical component of a well-handled sailboat.