The term Affiliation, in the context of the digital environment and especially websites, refers to the affiliation or connection of two or more separate sites to the same interested person, group, or owner.
This relationship establishes that although the websites may have different domains, different designs, or focus on different niches, they are controlled or managed by the same entity. In the field of marketing and search engines, disclosure of Affiliation can be important for both transparency to users and compliance with search engine rules and policies, especially when the sites have intertwined or mutually supportive business models.