In the Double Slit Experiment, what type of wave are we talking about?

Question

I was learning about the double slit experiment and simple explanation is that there is wave interference. Although I do not quite understand the wave bit. We know that light is a wave.

But in the image of the wave interference we see something like two ripples (in water) that interfere.

I couldn't understand that how could a sine wave, pass through a slit and then suddenly become ripples.
P.S.
If we imagine a sine wave passing through a slit, we (or probably I) should expect a sine wave, because the front side of the sine wave is one-dimensional and that passing through a slit just a wee wide, shouldn't change anything.

The Dude · Answer

As the wave passes through both slits the light diffracts into two coherent waves. Try to imagine the sine wave graphic (top picture) but from above. It's the same principle as a ripple; it's just crests and troughs. The lower graphic can be misleading as when you'd do this experiment with a laser there isn't nearly that much spread of the beam before it encounters the slits.
https://en.wikipedia.org/wiki/Diffraction

In the Double Slit Experiment, what type of wave are we talking about?

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