Relevance shows the importance of individual pages within the website. It’s not a page grade, so it doesn’t say anything about your page’s health; it only reflects the importance (“authority”) of the page.
A page’s relevance is calculated using many factors, including the number of internal links pointing to the page, its depth within the website structure, and how often its content changes (the more often, the more relevant).
The higher a page’s relevance score, the more important it is within the website. You can use the slider to filter for pages with at least a certain relevance score.