What is the function of a fender on a boat?

A fender on a boat serves the essential purpose of providing cushioning to protect the vessel from damage when it comes into contact with a dock or another boat. When a boat is moored, fenders are positioned along the sides to absorb the impact and minimize the risk of scratches, dents, or other structural harm that can occur during docking maneuvers or when wind and currents push the boat against hard surfaces.

This protective function is crucial for maintaining the integrity of the boat's hull and overall appearance, making fenders a vital piece of equipment for both safety and maintenance. Other options do not reflect the primary role of fenders; they are not designed to enhance sales, increase speed, or collect rainwater, but rather, specifically focus on cushioning and protection during docking and mooring.