Wikipedia articles that need expanding, also known as 'stubs', are articles on Wikipedia that are incomplete and require additional information. These articles are identified by a template at the top of the page, which indicates that the article is a stub and needs to be expanded. Stubs are often created when an article is first created, but can also be created when an article is edited and more information is needed. Stubs are important for Wikipedia because they allow editors to add more information to an article and make it more comprehensive.