Resonance is an example of

Explanation

Resonance : If a body is made to vibrate by an external periodic force, whose frequency is equal to the natural frequency (or nearly so) of the body, the body vibrates with maximum amplitude. This phenomenon is called resonance.

The corresponding frequency is called the resonant frequency. For low damping, the amplitude of vibrations has a sharp maximum at resonance, as shown in the figure. The flatter curve without a sharp maximum is for high damping
Example: To listen to a radio station or to view a TV channel, the frequency of the electrical oscillator circuit in the receiver set is adjusted to that of the broadcast wave of that channel. Then, from all the waves intercepted, the receiver selectively picks up the wave of only that channel and amplifies it.