Difference between impact wrench and impact driver?

I think I need an impact tool. I have the chance to buy a used impact wrench (Dewalt) but unsure of the difference between that and an "impact driver". The impact wrench is electrical. Are they if effect one and the same. Would I assume I could easily remove bolts from a tire to change it? Would I also... show more I think I need an impact tool. I have the chance to buy a used impact wrench (Dewalt) but unsure of the difference between that and an "impact driver". The impact wrench is electrical. Are they if effect one and the same. Would I assume I could easily remove bolts from a tire to change it? Would I also assume I need a series of sockets for it to fit? THANKS to all for concise responses!!
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