There are many kind of waves, both on the surface and inside the sea. They are caused by wind blowing over the sea, by Underwater Earthquakes and by the effects of the Sun and the Moon(Astronomical Tides).
If we blow across the basin full of water, we can see at once the wave is formed by the wind. The wind blows over the surface of the sea, making the waves large or small according to its force and intensity.
But the wind doesn't cause any movement of water from one place to another or drive it in any one direction. Even when it forms very high waves the water remains practically still.
This is say that waves are the rise and fall of the individual drops of water on the surface of the sea. They make a closed circular movement in a vertical direction.
The movement spreads and therefore, the waves seem to chase one another as far as the eye can see.
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