The hammer drill is heavy and large, like a small jackhammer. It may hold an adapter into which bits may be attached. It has a hexagonal socket in place of a chuck. The impact drill (driver) is shorter and stubbier. In appearance, the two drills differ dramatically. An impact driver should not be used for woodworking since extra power may kick in at any time when needed by the fastener being employed, and damage the item being handled. It can drive nails through sheetrock if needed, and it can be used in any situation that requires a regular drill.
In contrast, an impact driver is used mainly for driving in fasteners like screws and nails. Some hammer drills do have a feature which allows the user to turn it back into a regular drill. A hammer drill can and usually should be used for drilling into a hard surface like brick or concrete, i.e., masonry.
First, the two types of drills differ in purpose.
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