A Radio Frequency Jammer is a device designed to disrupt or block radio signals. It emits signals on the same frequency as the targeted communication, effectively overpowering it. This can interfere with various types of wireless communications, including those used by mobile phones, Wi-Fi networks, and even military equipment. These jammers are often used in specific situations, such as in military operations to prevent enemy communications or in security settings to stop unauthorized transmissions. However, their use is heavily regulated in many countries due to potential misuse and the impact on legitimate communications.