Identification Friend or Foe (IFF) is a military system used to distinguish between friendly and enemy forces. It employs electronic signals to identify aircraft, ships, or vehicles, ensuring that friendly units can recognize each other and avoid accidental attacks. IFF systems typically use transponders that send out coded signals. When a friendly unit receives these signals, it can confirm the identity of the other unit. This technology enhances situational awareness and helps prevent friendly fire incidents during combat operations.