Incubator serves as a platform where anyone can build up a community in a certain language edition of a Wikimedia project (Wikipedia, Wiktionary, Wikibooks, Wikinews, Wikiquote and Wikivoyage) that does not yet have its own subdomain, provided that it is a recognized language. These so-called "test wikis" on Incubator can be used like any other real wiki. When the community desires so, they can request to move to an own subdomain through the requests for new languages process. The decision is made by the Language committee.
Wikimedia Incubator is unique in the sense that it is not a real content project like Wikipedia, the free encyclopedia, nor an organizational project like Meta-Wiki, which coordinates the different Wikimedia Foundation projects.