IFF stands for "Identification Friend or Foe," a system used primarily in military and aviation contexts. It helps distinguish between friendly and enemy forces by using electronic signals. When an aircraft or vehicle sends out a specific signal, the IFF system can identify it as friendly, allowing for safer operations during combat or in crowded airspace. The IFF system typically involves a transponder that responds to interrogation signals from radar systems. This technology is crucial for preventing friendly fire incidents and ensuring effective coordination among allied forces. It is also used in civilian aviation to enhance air traffic safety and management.