Jetties are structures built along coastlines or riverbanks to protect harbors and navigation channels from erosion and sediment buildup. They are typically made of stone, concrete, or wood and extend into the water, guiding currents and waves away from shore. This helps maintain safe passage for boats and ships. In addition to their protective function, jetties can also create calm areas for recreational activities like fishing and swimming. They often serve as popular spots for tourists and locals alike, providing access to scenic views of the water and surrounding landscapes, enhancing the overall enjoyment of the coastal environment.