- Analytics SDK
- Firebase SDK
- Google Ads
- Analytics tag
The correct answer is: Analytics tag
You can add the Analytics tag directly to the HTML of each page on your site, or indirectly using a tag management system such as Google Tag Manager.
Every time a user visits a webpage, the tracking code will collect anonymous information about how that user interacted with the page.
Read more here: https://support.google.com/analytics/answer/6086097