A Digital Object Identifier, or DOI, is a unique alphanumeric string assigned to a digital object, such as a journal article, research paper, or dataset. It provides a permanent link to the object on the internet, making it easier for users to locate and access the content. DOIs are widely used in academic publishing to ensure that references remain stable over time, even if the location of the content changes. When a DOI is assigned, it typically follows a specific format that includes a prefix and a suffix. The prefix identifies the registrant, while the suffix is unique to the specific object. By using a DOI, researchers and readers can quickly find and cite sources accurately, enhancing the reliability of academic work.