Types of Waves
Transverse Wave, Longitudinal Wave and High-frequency Wave
Transverse Wave: A transverse wave is a moving wave that consists of oscillations occurring perpendicular (or right angled) to the direction of energy transfer.
Light, radio wave, electromagnetic wave, earth wave (secondary wave), spring motion (sidewards)
Longitudinal Waves (Compression Waves)
Longitudinal waves are waves in which the displacement of the medium is in the same direction as, or the opposite direction to, the travel direction of the wave.
Voices, ultrasound, earth wave (primary wave), spring motion (back and forth)