In the context of boating, what does the term 'tiller' specifically refer to?

The term 'tiller' specifically refers to a handle used to steer a boat. It is typically attached to the rudder, and when the tiller is moved, it changes the direction of the boat by pivoting the rudder, which then directs the flow of water behind the boat. This mechanism is vital for maneuverability, allowing the operator to control the vessel's direction effectively.

Understanding the role of a tiller is essential for safe navigation and handling of a boat, as it enables precise steering to respond to changing conditions on the water. In contrast, the other options refer to different components of sailing or boating that do not involve the direct steering actions performed using a tiller. For instance, adjusting sails involves different mechanisms entirely, and engine types and hull structures are separate aspects of boating design and operation.