A jammer is a device designed to emit radio frequency signals that interfere with or block wireless communications within a certain area. By overwhelming the frequencies used by devices such as cell phones, Wi-Fi routers, or GPS systems, jammers prevent these devices from sending or receiving signals. Jammers are often used for malicious purposes, such as disrupting communications during a cyberattack or preventing the operation of security systems. However, their use is illegal in many countries due to their potential to disrupt critical communications, including emergency services. Understanding how jammers work is important for cybersecurity professionals to detect and mitigate wireless threats.