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When users search on a Refined site, the search results may show articles as well as pages.
Articles are content from Confluence spaces that are linked as knowledge base to a JSM portal. They can be seen by all users of a JSM portal that has a linked knowledge base.
Pages are content from Confluence spaces that are added as Atlassian Content in the Site Builder. They can be seen by users with the right Confluence license, or by everyone if the content is anonymously available.