A sea wall is a structure built along coastlines to protect the land from the effects of waves and erosion. These walls are typically made of concrete, stone, or other durable materials and are designed to absorb and deflect the energy of incoming waves. By doing so, they help to prevent flooding and damage to coastal properties and infrastructure. Sea walls can also create a barrier that helps to maintain the shape of the coastline. While they are effective in protecting against immediate threats, they can sometimes lead to increased erosion in other areas, making careful planning essential.