High-frequency devices are electronic tools that operate at high frequencies, typically in the range of megahertz (MHz) to gigahertz (GHz). These devices are commonly used in communication systems, such as cell phones, radios, and Wi-Fi routers, allowing for the transmission of data over long distances with minimal interference. These devices utilize high-frequency signals to carry information, enabling faster data transfer rates and improved performance. Examples include microwave ovens, which use high-frequency electromagnetic waves to heat food, and radar systems, which detect objects by bouncing high-frequency signals off them.