The service is part of a re-release by the Library of Congress of its Print & Photographs Online Catalog. It provides access to a rich image collection for incorporation into other applications. Applications can search the catalog by description term, and if desired within particular collections, for specific image types, etc. Results can include just descriptive metadata or the images themselves, presented as a list, grid, slideshow, or gallery.
API methods support specification of a search query, either across the entire collection or restricted to certain elements, along with optional filtering criteria like subject and format. Methods also enable structuring of results and retrieval of related items.