A GPS jammer is a device that disrupts the signals from Global Positioning System satellites. By emitting radio frequency signals on the same frequency used by GPS devices, it creates interference that prevents accurate location tracking. This can affect various applications, including navigation systems in vehicles and smartphones. These jammers are often illegal to use in many countries because they can interfere with essential services, such as emergency response systems. While some may use them for privacy or security reasons, their use can lead to significant safety risks and legal consequences for individuals and organizations.