This document discusses ORCID, a registry that provides researchers with a unique identifier to help distinguish them from others with similar names. It notes challenges in identifying researchers due to name variations and ambiguities. ORCID aims to address this by assigning persistent digital IDs that uniquely identify individuals and can link to their professional activities and affiliations. The document outlines how ORCID benefits researchers, universities, publishers, funders and more by enabling identity verification and information sharing through its registry and API. It provides statistics on ORCID usage and member organizations.