FAQ About Data Measurement in Analytics

By downloading the Tracking Code on the Analytics page, you give Google permission to track it. After you add this code to your website Google collects information such as which browser users have logged in, which language they use, how many people comes to your website or where did they came from to give you. By downloading this code, Google places a cookie on the user's computer, which collects the user's behavior. 

Also it can be done from the Tag Manager section. Pluggins are also can be used. Finally, you can have Google track your data by uploading your data to your account.