Dry skin lacks natural oils (lipids), making it feel rough, flaky, and more prone to irritation, and it often appears dull or lackluster. Dehydrated skin, on the other hand, lacks water, which causes it to feel tight, show fine lines more prominently, and look dull or sallow. Dry skin is a skin type, whereas dehydration can affect any skin type, including oily or combination skin. Dehydrated skin can be improved by increasing water intake and using hydrating products, while dry skin benefits from products that replenish oils.