A common scenario: You place an Ad on Facebook, people click on the Ad and jump to your website, and they will see a form that is only visible to them. Source can help you achieve this requirement.
Source is divided into 2 types：Common source and Custom source.
Common source: the source commonly used, you don't need to input the URL, just select the checkbox.
Custom source: if the common source does not contain the source you need to define, you can add the source yourself.
The following common sources are supported:
Direct visit to store. People enter the URL of your website in their browser and visit your website directly.
Google Ads. People click on your Google Ads to visit your website.
Google Search. People search for your website on Google and click on the search result to visit your website.
Facebook. People click on your Facebook Ads to visit your website.
Custom source: a person visits page A outside your website, and there is a link to your website on the page. The person clicks on this link and visits your website. Page A is the source page of this visit.
You can define multiple Common sources and Custom sources, people will see the form if their source matches any of the sources you define.