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This page in a nutshell: Although disambiguation pages reside within the Main space (often called "article space"), they are not considered articles. They are considered navigational aids.
Wikipedia uses different tools for disambuation, with disambiguation pages being one of those tools. Although disambiguation pages reside within the Mainspace (often called "article space"), they are not considered articles. They are considered navigational aids. Hence,
Disambiguation pages in contrast with set index articles
In some cases, set index articles appear similar to disambiguation pages (in other cases they do not), but in spite of the similarity, set index articles are considered articles and hence provide more than just navigational information.
Examples of set index articles that appear similar to disambiguation pages:
