An LC circuit, also known as a resonant circuit, consists of an inductor (L) and a capacitor (C) connected together. This circuit can store energy oscillating between the magnetic field of the inductor and the electric field of the capacitor. The frequency of these oscillations is determined by the values of the inductor and capacitor, allowing the circuit to resonate at a specific frequency. LC circuits are commonly used in various applications, including radio transmitters and receivers, where they help select specific frequencies for communication. They are fundamental in electronics, enabling efficient energy transfer and signal processing in many devices.