Pocket doors are sliding doors that disappear into a wall when opened, saving space and providing a sleek look. They are often used in smaller rooms or areas where traditional swinging doors would be impractical. These doors operate on a track system, allowing them to glide smoothly in and out of the wall cavity. Pocket doors can be made from various materials, including wood, glass, or metal, and can be customized to match the decor of any room. They are a popular choice for modern homes and renovations.