1. Waves which require a material medium for their propagation are called mechanical waves.
Example: Sound waves, string waves, seismic waves, etc.
2. Waves which do not require material medium for their propagation are called electromagnetic waves.
Example: Light waves, radio waves, y-rays, etc.
3. The wave associated with any object when it is in motion is called as matter wave.
4. Waves in which a disturbance created at one place travels to distant points and keeps travelling unless stopped by an external force are known as travelling or progressive waves.
5. Waves are also of stationary type.
