A DOI, or Digital Object Identifier, 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 content, making it easier for users to locate and access the material online. The DOI system is widely used in academic publishing to ensure that references remain stable over time. When a DOI is assigned, it typically begins with "10." followed by a prefix and a suffix that identifies the specific item. This system helps to avoid confusion between similar titles and ensures that citations are accurate, facilitating better research and information sharing in the scholarly community.