Pardot sets first-party cookies for tracking purposes, and sets third-party cookies for redundancy. Using first-party and third-party cookies together is standard in the marketing automation industry. Pardot cookies do not store personally identifying information, they store only a unique identifier.
Sometimes Pardot has to use third-party cookies: this exception is based on how different web browsers handle cookies. Pardot will use third-party cookies in the following instances:
See How does Pardot track activities? for more information on how Pardot cookies work.
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