Temperature is just the average kinetic energy of the atoms and molecules in a substance… and more kinetic energy means more speed. So with ice, you have all of the water molecules arranged in a neat and proper grid. They can all jiggle around and vibrate a little bit (the temperature isn’t zero), but they can’t move all that much because they’re stuck together in their little grid.
As the temperature goes up, they jiggle more and more. Eventually, the jiggles are so big that the molecules can’t stay in a nice grid anymore, so they break off to do their own thing, and boom, you’ve got liquid water!
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