The SERPs is the method by which you can check how your site appears on Google’s Search Engine first page. Let’s say your site ranks on the first page of Google for the keyword “SEO Tools".
That’s great for your site… until you see that SERP features show your website the #1 result in ranking.
Basically this tool will tell your where currently your website is positioned in Ranking of Search engine Google. If your ranking is low then you need to further optimize SEO techniques to rank your pages.
