A sump pump is a machine that pumps the water out in case of any flooding. Sump pumps are usually installed at the lowest level of your house. You may also refer to this as an additional unit to protect your home from flooding. Many basements flood whenever there is a rise in water level, and especially those below the water table tend to flood quite often.
Please read the originial post here: https://safedryout.wordpress.com/2020/10/07/sump-pump-and-its-benefits/