The term "book wagon" refers to a mobile library or bookmobile, however, there are several other synonyms for the same. One such synonym is a bibliobus, which is commonly used in parts of Europe. In Australia, the term "library van" or "book van" is used to describe a mobile library, while in the United Kingdom the term "library on wheels" is more commonly used. In the United States, the term "bookmobile" is the most frequently used synonym for book wagon. No matter what it is called, a mobile library provides a unique service, bringing books and literature closer to people who may not have the ability to regularly visit a traditional brick-and-mortar library.