* Transverse Wave: A wave where the particles of the medium move perpendicular to the direction the wave travels. Think of a ripple on a pond or a wave on a string.

* Disturbance: This could be any force or change that sets the particles in motion.

Examples of disturbances that can cause transverse waves:

* Electromagnetic radiation: Light, radio waves, microwaves, X-rays, etc. are all transverse waves caused by oscillating electric and magnetic fields.

* Vibrating string: When you pluck a guitar string, you create a transverse wave.

* Surface waves in water: These waves are a combination of transverse and longitudinal motion, but the primary movement of water particles is perpendicular to the wave's direction.

Key Point: The source of energy for a transverse wave is the initial disturbance that sets the particles in motion. The wave then propagates through the medium as the energy is transferred from particle to particle.