Every homeowner should have at least one claw hammer in their tool box. Claw hammers are so named because the flat head of the hammer is asymmetric to the claw end of the hammerhead.
Claw hammers are most efficient and usually used while working with wooden surfaces.
A 16-ounce model is usually considered the most versatile. It is heavy enough to drive large nails and yet limber enough to be able to extract bent and broken fasteners with ease. For general use by a homeowner a finish head hammer is recommended, it has a smooth, slightly rounded striking surface on the head of the hammer. It will leave a slight indentation in the wood but usually does not mar the surface.