The Active Denial System (ADS) is a non-lethal weapon developed by the U.S. military. It uses directed energy to create a sensation of intense heat on the skin, causing discomfort without causing permanent harm. The system operates by emitting a focused beam of millimeter waves, which are similar to those used in microwave ovens but at a much lower intensity. ADS is designed for crowd control and to deter potential threats without resorting to lethal force. It has been tested in various scenarios, including military operations and law enforcement situations, aiming to provide a safe alternative for managing hostile encounters while minimizing risk to civilians.