Topic clusters revolve around a specific topic.?A?pillar page is first created that covers all aspects on that topic. Then, supporting articles are created to go in-depth on specific aspects of the topic and link back to the pillar page.?
In the end, you have all your content sorted by topic with one general overview and many in-depth articles to support the overview.
Topic clusters are an important SEO tactic for increasing search visibility for target keywords.