A flood barrier, or floodwall, is a structure designed to prevent flooding from occurring in areas prone to high water levels. Synonyms for a flood barrier include flood defenses, flood protection systems, levees, dikes, embankments, and seawalls. Each type of flood barrier works in a distinct way to prevent floods. Levees and embankments use natural materials such as soil or rock to strengthen existing barriers, while seawalls and flood protection systems rely on concrete or steel to withstand the force of waves and tides. Regardless of the type, flood barriers play a crucial role in protecting communities and infrastructure from the devastating effects of flooding.