DOI stands for Digital Object Identifier. It is a unique alphanumeric string assigned to a digital object, such as a journal article, book chapter, or dataset. The purpose of a DOI is to provide a persistent link to the digital object, making it easier to locate and cite. DOIs are widely used in academic publishing to ensure that articles and other digital objects can be easily identified and cited, regardless of changes to web addresses or other metadata. DOIs are typically assigned by a registration agency, such as CrossRef, and are often displayed as a hyperlink that can be clicked to access the digital object.The DOI (Digital Object Identifier) is used to provide electronic documents  citation and links. The DOI is composed  of a distinctive alphanumeric character which is assigned by publisher  to each article  when  published and made available electronically. A DOI is a permanent ID that, when attached to in the address bar of an Internet browser, will lead to the original source like: .