Pocket doors are sliding doors that disappear into a wall cavity when opened, saving space in a room. They are often used in areas where traditional swinging doors would be impractical, such as small bathrooms or closets. These doors can be made from various materials, including wood, glass, or metal, and come in different styles to match home decor. Pocket doors are a popular choice for modern homes due to their sleek design and ability to create an open feel in tight spaces.