Interior paint is specifically designed for indoor use, providing a smooth finish and a variety of colors to enhance the look of walls and ceilings. It is formulated to resist stains, fading, and mildew, making it suitable for living spaces, kitchens, and bathrooms. Exterior paint, on the other hand, is made for outdoor surfaces and is more durable to withstand weather conditions like rain, sun, and temperature changes. It often contains additives to prevent mold and UV damage, ensuring that the paint lasts longer on surfaces such as siding, fences, and decks.