Degaussing is a process used to reduce or eliminate a magnetic field from an object, typically a computer monitor or hard drive. This is important because magnetic fields can distort images or corrupt data. Degaussing works by exposing the object to a fluctuating magnetic field, which neutralizes its existing magnetic field. In addition to electronics, degaussing is also used in naval ships to protect them from magnetic mines. By reducing their magnetic signature, these ships become less detectable to enemy devices. Overall, degaussing is a crucial technique in both technology and military applications.