Whats difference between Hammer and Impact drills, which one is better ?

. . I am thinking to buy a drill machine, I don't have any knowledge about apart of the fact that they are very useful when you want to do things at like drilling whole in wall and fastening things like wall lamp or may be a show-piece. But when I looked online for a good deal, I found there are hammer drill and impact drill machine.

That's confusing, since I am just buying it for daily house hold uses, which one is best for me .. hammer drill or impact drill machine ?

Suggestions are invited, other than drilling what more things we can do with them ?

Hammer drills are meant for heavy industrial level work and impact drills are more suitable for day to day house hold stuff. You may see that generally technician are using hammer drills when they need to penetrate into concrete / rcc wall or pillars, otherwise they use only impact drill.