The hub page is a page on the website that behaves like a main entry point for a particular content or topic. It gives an overview of the subject it is written about, and this branches out to different pages of content related to the same subject.
Hub pages are very important for SEO as they bring all the relevant information and keywords to one page and make it easy for the search engine to index and rank the page. They give the user the required information for their query and increase their engagement, reducing the bounce rate.