A tuned circuit, also known as a resonant circuit, is an electrical circuit designed to select a specific frequency from a range of frequencies. It typically consists of an inductor and a capacitor, which work together to create resonance. When the circuit is tuned to a particular frequency, it can efficiently filter signals, making it useful in applications like radio receivers and transmitters. The key principle behind a tuned circuit is resonance, where the inductive and capacitive reactances cancel each other out at a specific frequency. This allows the circuit to amplify or attenuate signals at that frequency, while minimizing others. Tuned circuits are essential in devices such as radios, televisions, and oscillators.