A library is a large collection of books, and can refer to the place in which the collection is housed. In the modern setting, the term can refer to any collection, including digital sources, resources, and services. The collections can be of print, audio, and visual materials in numerous formats. If you want to build a library, the budget will vary on the size and materials you will use. The number of books, collections, and other resources will require a bigger amount of money. Most public libraries operate on budgets in the millions of dollars.