A foresail's one of a few different types of sail set on the foremost mast (foremast) of a sailing vessel: A fore and aft sail set on the foremast of a schooner or similar vessel. The lowest square-sail on the foremast of a full rigged ship or other vessel which's square-rigged. Sails set forward of the foremast, such as jibs and staysails, are sometimes referred to as foresails, although "headsails"'s a more common term.… (More on Foresail)