Zero-Party Data – Definition

Information customers intentionally and proactively share with a brand — size, style preferences, interests — typically through account settings or preference centers.

Zero-party data complements first-party behavioral data with explicit customer input, giving content personalization a more precise, consented basis than inference from browsing behavior alone. Collecting it well requires giving customers a genuine reason to share it — a preference center that clearly translates into better recommendations gets meaningfully higher participation than one that asks for information without demonstrating any visible benefit. Because zero-party data is explicitly and knowingly shared, it also carries the least ambiguity around consent among all personalization data types, making it a good starting point for teams building a personalization strategy from scratch.