A circulating library is often referred to as a lending library and is a library that lends books for a specific period. The term subscription library is also synonymous with a circulating library. Another synonym is a bookmobile library, which is a mobile library that travels to different locations to lend out books. An alternative term for a circulating library is a rental library, as patrons rent books for a fee. A popular synonym for a circulating library is a public library, which offers a collection of books, periodicals, and other materials for borrowing. Lastly, a circulating library can also be called a community library, emphasizing its role in serving the needs of the local community.