Persistent identifier (PID) is a long-lasting reference to a resource
that provides the information required to reliably identify, verify and
locate the resource. In a digital environment, PIDs have the form of
URLs. When pasted in a browser, they take users to the resource.
Apart from digital resources, PIDs can also relate to researchers (e.g. ORCID, ISNI), institutions (e.g. ROR),
grants, instruments and devices, etc. In this case, a PID leads to the
record describing a researcher, an institution, etc. in the relevant
registry.