Blackout curtains are used to block out light from entering a room. They are made from thick, tightly woven fabrics designed to keep light out, making them ideal for bedrooms, nurseries, home theaters, or any space where you want to control lighting. Blackout curtains also provide added benefits such as enhancing privacy, reducing noise from outside, and improving energy efficiency by insulating against heat and cold. They are particularly useful for people who need to sleep during the day, such as shift workers, or for creating a dark environment for better sleep quality.