Google Analytics is a free tool from Google that allows you to measure how many visitors come to your website, their favorite pages, and where they come from. To use it, you need a Google account and must insert the tracking code Google provides on all pages of your website. Once implemented, you can check visitor numbers and interest in real-time, see the most visited pages, and understand where visitors originate from such as search engines, referrals, social media, or direct links. Google Analytics also provides keywords and search engines visitors used to find your site through its integration with Google Webmaster Tools.