Final answer:
An OID is a unique identifier used to identify objects in computing systems. ORCID provides a 16-digit OID for researchers. DOI is another system that uses unique identifiers for online sources.
Step-by-step explanation:
An OID (object identifier) is a globally unique identifier used in various computing contexts to uniquely identify objects, types, and other entities within a given system. In the context provided, ORCID (Open Researcher and Contributor ID) issues an ID that is a specific example of an OID. The ORCID ID is a 16-digit identifier assigned to researchers, helping them connect with their research contributions across different platforms and publications. This ID remains consistent, unlike a URL, which can change and cause confusion. Another system similar to ORCID in its use of unique identifiers is the DOI (Digital Object Identifier) system, which assigns a persistent identifier, usually a string of numbers and letters, to journal articles and other online sources. The DOI ensures that even if the content moves or the URL changes, the source can still be reliably found.