The amount of energy in a wave is related to its amplitude and its frequency.
The amplitude of a wave is how the wave is measured from the rest position or mid-line to the top of a crest or bottom of a trough, measured in meters.
A high amplitude wave is a high-energy wave, and a low-amplitude wave is a low-energy wave. For instance in the case of sound waves, a high amplitude sound will be loud, and a low amplitude sound will be quiet.