What's the difference between "います" and "いる"?
How would I use them? What's the difference between "なにをしているか ?" and "なにをしますか?"?

Question

What's the difference between "います" and  "いる"?
How would I use them? What's the difference between "なにをしているか ?" and "なにをしますか?"?

Answer

the first one is informal and the second is formal

Answer

As Carter said, its simply formality. The first is informal and the second is formal.