Which event is automatically triggered on your website when visitors view any page?

The event that is automatically triggered on your website when visitors view any page is the page_view event. This event is fundamental to tracking user interactions within GA4, as it provides essential insights into how visitors navigate through your website. Every time a page is loaded in the browser, this automatic tracking captures the page's relevant data, such as the URL and title, allowing for comprehensive analysis of user behavior.

Other events like session_start typically track the beginning of a user session, meaning they don't occur with every page view. Similarly, user_engagement measures active engagement with your content but isn't triggered on page view alone, as it looks for more specific interactions like scrolling or clicking. Lastly, the scroll event is recorded when a user scrolls down a page, capturing user engagement that goes beyond simply viewing the page. Therefore, page_view is the correct and most relevant event for tracking visits to any page on your website.