Google Search Console (formerly known as Google Webmaster Tools) is a free service offered by Google that helps you monitor, maintain, and troubleshoot your site’s presence in Google Search results.
You can use it to submit and check a sitemap, review crawling errors, analyse the linkage of your site, and more. It’s an invaluable tool, not just for managing your site’s Google presence, but for content marketing, technical SEO, research, and analysis.