The ORCID iD (Open Researcher and Contributor ID) is a nonproprietary alphanumeric code to uniquely identify scientific and other academic authors and contributors.
It provides a persistent identity for humans, similar to that created for content-related entities on digital networks by digital object identifiers (DOIs).
The ORCID iD addresses the problem that a particular author’s contributions to the academic literature can be hard to recognize, as most personal names are not unique, they can change (such as with marriage), have cultural differences in name order, contain inconsistent use of first-name abbreviations and employ different writing systems,
As the ORCID iD is unique to every individual, the author’s academic contributions can be recognized instantly by this unique identifier, irrespective of the similarity or changes in personal name over time.
Why should you register?
It distinguishes you and ensures your research outputs and activities are correctly attributed to you
It provides reliably and easily connects you with your contributions and affiliations
It reduces form-filling (enter data once, re-use it often)
It improves recognition and discoverability for you and your research outputs
Orchid iD is interoperable (works with many institutions, funders, and publishers)
It is persistent (enduring)
Your iD is yours throughout your career, no matter where you work, who funds you, whether your name or field of research changes, or if your name appears in different forms in different places.
(Source: ORCID website, Wikipedia)