Yes, a dryer should be plugged into a properly grounded electrical outlet for safety reasons. Grounding is an important electrical safety measure that helps protect against electrical shocks and prevents damage to the dryer and other appliances. A grounded outlet typically has three prongs, including a grounding prong that is connected to the grounding system of the building. This grounding connection allows excess electrical current to be safely directed into the ground in the event of a fault or electrical surge. It is crucial to follow the manufacturer's instructions and local electrical codes when installing and connecting any electrical appliance, including a dryer.