A bookcase, or bookshelf rack, is a furniture piece used to store books and printed materials. It comes in various sizes, from small tables to ceiling-height models. Bookshelf racks can be fixed or adjustable and are found in homes, libraries, offices, and bookstores. They offer options like glass doors for dust and moisture protection, and some have locked cases for valuable rare books. Office bookcases with unique designs and wall bookshelves provide additional storage solutions with style and security.