Leaks in my the Fridge?

Okay so here's the problem. My fridge is leaking from the inside. From what I can tell it's just water and that's okay. What I wanna know is why is the fridge is leaking. My fridge isn't the ones that have an ice maker in them. The water that settles in the little tubs we put in the fridge do have ice in them. There is also some ice towards the roof of the fridge too if that helps, It is just a annoying problem that I want to get rid of. The water gets everything in the fridge wet and it's just annoying. We have even tried vacuuming behind and under the fridge to see if that stopped the problem. Has this happened to anyone before? And what would be some good ways to stop the leaking? Would we have to defrost the fridge to see of that helps?