Chaff (countermeasure)
In the military, chaff are small thin pieces of metal which are shot out of an airplane or warship. These thin strips of metal make it harder for enemy radar to detect where the plane or ship is. The thin strips of metal also make it harder for radar-guided missiles to hit the plane or warship. The chaff tricks the enemy and helps to keep the plane or warship safe. Chaff was invented during World War II.