Ginger is a flowering plant in the family Zingiberaceae whose rhizome, ginger root or simply ginger, is widely used as a spice or a folk medicine.
Like the name indicates, dry ginger powder is the grounded form of dried ginger roots. It is essentially used as a seasoning agent. However, the powdered form doesn't carry the strong pungent flavor from the roots. Hence, it is used for giving a mild taste to the dishes.