What structures are built parallel to the shoreline protect boats from force of large breaking waves?

The structures that are built parallel to the shoreline to protect boats from the force of large breaking waves are called breakwaters. Breakwaters are barriers constructed in the water to dissipate the energy of incoming waves before they reach the shore or a harbor entrance. They are designed to reduce wave action, protect harbors, and provide safe berthing conditions for boats and ships. Breakwaters can be constructed using various materials, including concrete, stone, or steel. They are often built perpendicular to the shoreline and may be located at a distance from the shore to provide maximum protection.