A bookshelf is a piece of furniture with horizontal shelves, used to store books or other printed materials. Bookshelves are used in study room, private homes, offices, public and school & college libraries and book stores. Shelves may be fixed or adjustable to different positions in the case. Such as libraries, they may be permanently fixed to the walls and floor. A bookshelf may be fitted with glass doors. It protects the books from dust. A small bookshelf may also stand on some other piece of furniture such as desk.