Mast

A tall vertical spar or structure on a sailing vessel that supports the sails, rigging, and sometimes navigation equipment.

A mast is one of the most essential components of a sailing vessel, providing the necessary height and support for the sails, which in turn harness the wind to propel the boat forward. Traditionally made from wood, modern masts are often constructed from materials like aluminium or carbon fibre to enhance strength and reduce weight. The mast is typically stepped (mounted) on the keel or deck of the vessel, and it is secured by a network of standing rigging, including shrouds and stays, which prevent it from toppling under the force of the wind. 

On larger vessels, there may be multiple masts, each with its own specific name depending on its position and function. For example, the foremost mast on a two-masted vessel is called the foremast, while the rear one is the mainmast. The configuration of masts and sails varies depending on the type of vessel, with some ships, such as schooners or ketches, having different arrangements of masts and rigging. 

In addition to supporting sails, masts often carry important equipment like radar, lights, and antennas, making them critical not just for propulsion but also for navigation and communication. The height of the mast is a crucial factor in determining the amount of sail area a vessel can carry, directly influencing its speed and handling characteristics.