Overview

A Digital Object Identifier (DOI) is a standardized, persistent identifier assigned to a digital object so it can be reliably cited and located over time. Unlike a web address (URL) that points to a current location, a DOI resolves through a central service to the object's landing page or metadata record even if the object's location changes. The DOI concept is widely used in scholarly publishing, research data management, and digital archiving.

How DOIs work

Each DOI consists of a prefix and a suffix separated by a slash (for example, 10.1000/182). The prefix identifies the registrant or assigning agency; the suffix is chosen by the registrant to identify the specific object. A DOI is expressed in human-readable form and as a resolvable URI: for example, https://doi.org/10.1000/182. When someone follows that URI, a resolution service redirects the user to the current location or a descriptive landing page for the object. Metadata about the object (title, authors, publisher, publication date, and other attributes) is stored with the DOI record by the registering organization.

Governance and registration

DOIs are managed within a formal system overseen by the International DOI Foundation; registration agencies and service providers operate the practical infrastructure. Organizations such as the registration authority, CrossRef and DataCite commonly register DOIs for publishers, data centers, and institutions. These agencies require deposit of basic metadata and a target URL so the DOI can be resolved. The underlying resolution technology is based on a handle system that maps identifiers to resource locations.

Uses and examples

DOIs are most familiar in citations for journal articles, books, conference papers and theses, where they provide stable links in bibliographies and reference lists. They are increasingly assigned to datasets, software, reports, and other research outputs to support reproducibility and credit. For example, a scholarly citation may appear as "doi:10.1016/j.iheduc.2008.03.001," which identifies a particular article independent of where the article file is hosted. Publishers and repositories commonly display DOIs on landing pages and in citation export tools.

Advantages and limitations

DOIs improve discoverability, make citation linking robust, and support metadata-based services such as citation tracking. However, a DOI is only as persistent as the maintenance behind it: registrants must keep the DOI target information current. A DOI guarantees a stable identifier and metadata record, but it does not alone ensure perpetual access to the full content if hosts or publishers stop providing it. Best practice encourages depositing preserved copies in trusted repositories and keeping DOI targets up to date.

Practical notes

  • Format: prefix/suffix (e.g., 10.1000/182) and resolvable via the DOI resolver URL scheme.
  • Metadata: registrants supply descriptive metadata to support discovery and citation.
  • Maintenance: organizations must update DOI targets when content moves to preserve resolution.

Because DOIs are integrated into many publishing and indexing workflows, they play a central role in scholarly communication and digital resource management. For further technical and policy details, readers can consult the primary registration and service agencies referenced above.