A digital object identifier (DOI) is a string of numbers, letters and symbols that identify material published online, including scholarly articles, datasets, and ebooks. The DOI is permanently assigned to the item, making it easier to find across online publications and databases.
Here's an example of a DOI: 10.1109/MAHC.1987.10032.
Using a DOI makes requesting an item through interlibrary loan easier, and if you're citing an item with a DOI, it should be included in your citation.
