SEO is now shifting to a top cluster model, where a single "pillar" page acts as the main hub for an overarching topic and the multiple content pages that are related to the same topic, link back to the pillar page and to each other.
Topic clusters rearrange the architecture where clusters of content that cover a topic area link to a central pillar page that definitively -- yet broadly -- outlines the topic. By linking all internal content within that topic to a pillar page, search engines such as Google or Bing can easily scan all the content and understand that there is a semantic relationship between the page's content. The cluster setup also signals to search engines that there is real breadth and depth in the content, which gives the pillar page more authority on the topic. Algorithms like Google’s RankBrain reward this orderly linking with higher search placement.