Google Analytics collects data regarding your device, OS, browser, location(country), and history. Based on the data we can improve the website. Google Analytics works by the inclusion of a block of JavaScript code on pages in your website. When users to your website view a page, this JavaScript code references a JavaScript file which then executes the tracking operation for Analytics. The tracking operation retrieves data about the page request through various means and sends this information to the Analytics server via a list of parameters attached to a single-pixel image request. For more information check Googles own documentation:
How Does Google Analytics Collect Data?
Google Privacy Policy
