Zero-Party Data

The Short Answer

Zero-party data is information a customer deliberately and proactively shares with a business, such as answers to a preference quiz, a stated purchase intention, or profile details entered voluntarily. It differs from first-party data (observed behavior) because the customer chose to disclose it directly, which makes it especially reliable for personalization.

How It Works

A customer voluntarily provides information through a direct interaction: answering a preference quiz, stating a purchase intention, or filling out a profile field that was not required. The business does not have to infer or observe anything.

Why It Matters

Because the customer chose to share it, zero-party data tends to be unusually reliable for personalization and rarely raises the privacy concerns that observed or licensed data can, making it a valuable complement to first-party data.