17.3.3—Resonance involves a maximum amplitude of oscillations and that this occurs

A driven oscillator resonates when the driving frequency is near a natural frequency, producing a large amplitude; damping limits and broadens the peak.

Identify the driving source, natural frequency and response amplitude. More damping usually lowers and broadens the resonance peak.

Pushing a swing at its natural period builds a larger motion than pushing randomly, even with the same average effort.

Resonance is not always destructive and does not require zero damping; it is a frequency-response phenomenon.