Google Webmaster Tools

Google Webmaster Tools (or Google Search Console) is a free set of online instruments that allow you to monitor your website performance, define the way it appears for search engines, track your site visitors and a lot more. There are also additional tools available, such as Structured Data Testing Tool, Structured Data Markup Helper, Email Markup Tester, Google My Business, Google Merchant Center, PageSpeed Insights, Custom Search, Google Domains, Webmaster Academy, etc. You can check for their description at the following page.