WorldCat.org is an online catalog that libraries can join to make their holdings visible when users search WorldCat.org or WorldCat Local. WorldCat Local overlays a library's catalog system and is what users see when searching that library's catalog. It displays availability from the local library first, then other libraries in the consortium and WorldCat.org. Both WorldCat.org and WorldCat Local allow users to look up books and articles, sign in to access their accounts, and use features like lists, notes, bookmarks and reviews.
