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 and transmitters. Tuned circuits are essential in many electronic devices, including radios, televisions, and cell phones. By adjusting the values of the inductor and capacitor, engineers can fine-tune the circuit to respond to different frequencies, enabling clear signal reception and transmission.