Resonance is when one object vibrates at the same natural frequency of another forcing the second one into vibrational motion. Not all frequencies will have this effect. This explains exploding wine glasses or when my cupboard doors rattle during a gong bath or when you hear a noise in a car only at certain speeds.
In nature frogs use resonance to attract mates. The tree-hole frog amplifies the sound of its call by adjusting its pitch to match the resonant frequency of its echo chamber in a tree knowing that the louder their call, the greater likelihood of attracting a mate. See how he adjusts his pitch here
https://www.youtube.com/watch?v=g3Yp7w7zsRQ&t=106s&ab_channel=NathanLitjens
Other frogs sit in water and change the frequency of their calls to resonate with the surrounding water to create ripples. The ripples serve to mark their territory and trigger louder and more sustained croaking. One downside of creating ripples is that bats use echolocation to find the epicentre and their evening meal!
Watch the ripples being formed here
https://www.youtube.com/watch?v=dDX2NnEpRgU&ab_channel=%E6%9E%97%E5%AD%90%E6%9A%98
In sound healing we use resonance to stimulate the natural frequencies of cells, tissues, organs and emotions using a variety of instruments in order to re-harmonise prime resonance, one without blocksges where energy runs freely. This is our objective.
The goal of life is to make your heartbeat match that of the universe, to match your nature with Nature. Joseph Campbell