Breakwaters are structures built along coastlines to protect shorelines and harbors from the impact of waves and erosion. They are typically made of large rocks or concrete and can be either floating or fixed to the seabed. By absorbing and reflecting wave energy, breakwaters help create calmer waters for boats and reduce the risk of flooding in coastal areas. These structures can also promote sediment accumulation, which can help maintain beaches and prevent erosion. Breakwaters are often used in conjunction with other coastal management strategies, such as sea walls and groins, to enhance coastal protection and improve navigation in busy ports.