Google Search Console is a tool that is linked to your site and provides information on data about the health of your site, backlinks, search queries and more useful information.
You can also use the search console to submit a sitemap to Google for indexing.
You can optimise the experience on your site, get alerts for bugs and fixes or understand how Google sees the content on your site.
It has a range of features and can be a great asset when building a site or monitoring your current one.