WorldCat

WorldCat is a joint collection of the world’s libraries, which is built with the contribution of librarians within individual, regional and national programs. WorldCat includes the most sought-after electronic and digital materials, as well as the most important ones that can only be found in local libraries. WorldCat connects users with hundreds of millions of electronic sources, including e-books, licensed databases, online journals and digital collections.

OCLC

Today, OCLC describes itself as a “non-profit organization, based on membership” which consists of more than 72,000 libraries in 170 countries. The most important product of the OCLC is the WorldCat joint database.