Tracker domains in Pardot are custom subdomains that are used to track visitor activity on your website.
The purpose of using tracker domains is to ensure that your website traffic is accurately and securely tracked, while also preserving the integrity of your main domain.
By using a separate tracker domain, you can ensure that any cookies or tracking scripts placed on your website will not affect your main domain, and will not interfere with the privacy and security of your visitors.
In Pardot, you can set up and manage multiple tracker domains to better track your marketing efforts and better understand your website traffic and conversions.