A tuned 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 at a particular frequency. This resonance allows the circuit to amplify signals at that frequency while attenuating others, making it useful in applications like radio receivers. Tuned circuits are essential in many electronic devices, including radios, televisions, and oscillators. By adjusting the values of the inductor and capacitor, engineers can change the resonant frequency, enabling the circuit to tune into different channels or signals effectively.