This document summarizes OCLC's WorldCat database and services. WorldCat contains over 203 million bibliographic records and 1.6 billion library holdings. It is growing rapidly, with 57.5% of records in non-English languages. WorldCat.org provides a global library search engine and sees over 16.9 million monthly users. OCLC aims to help libraries share metadata faster and improve discovery at a global scale through WorldCat and related services.