A library feature is a service or item that is available in a library. The most common library features are catalogs, alcoves, shelves, and card catalogues. A CATALOG is a list of books, periodicals, and other materials available in the library. An ALCOVE is a small area within the library that is used for reading or studying. Shelves are used to store books and other materials in the library. A card catalogue is an index of books and other materials available in the library.