Why are there waves and ripples on the sea surface when it is windy? Why that shape?

I have watched popular science programs before, because there is a film on the water surface, just like you slowly fill a cup with water, even if it is full to the edge, it will not overflow! You can try it yourself. It's amazing. Then when the water is blown by the wind, there will be layers of waves, which should also be because of that film, just like a light cloth.