A wave is a disturbance that travels through time and space usually by the transfer of energy.There are different types of waves.
1)Longitudinal waves
2)Transverse waves
When the particles of the waves are displaced parallel to the direction of the propagation of the wave, it is called the longitudinal wave.
When the particles of the waves are displaced perpendicular to the propagation of the wave, it is called transverse wave.
You can also see the link given here for the progressive waves.
Next time we will learn about the properties of waves.
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