Dry ginger powder is widely used in the kitchen to add flavor and aroma. The powder is extracted from the ginger root which is dried. It is a fine off-white or slightly brownish powder that has a strong aroma and a pungent flavour. Easy to store, ginger powder has a long shelf life of about one year.
Ginger, the spice, is just dried ginger root ground into a powder. This, of course, is all just semantics. You'd not be wrong to call ginger root just "ginger". Yes, Ginger Root (fresh) and Ginger (dried/ground) are the same product, but different form and intensity.