Blackout curtains are specially designed window treatments that block out light from outside. They are made from thick, opaque fabrics that prevent sunlight from entering a room, making them ideal for bedrooms, home theaters, or any space where darkness is desired. In addition to blocking light, blackout curtains can also help with temperature control and noise reduction. They keep rooms cooler in the summer and warmer in the winter, contributing to energy efficiency. Many people use them to improve sleep quality by creating a darker environment, especially during the day.