Jamming devices are electronic tools designed to disrupt communication signals. They work by emitting radio frequency signals that interfere with the normal operation of devices like cell phones, Wi-Fi routers, and GPS systems. This interference can prevent these devices from sending or receiving information, effectively "jamming" their communication. These devices are often used in various settings, such as military operations to secure sensitive information or in security applications to prevent unauthorized access. However, the use of jamming devices is illegal in many countries, as they can disrupt essential services and pose risks to public safety.