Reference / Glossary / Infrastructure and standards
Topics API
A Privacy Sandbox API in Chrome that infers a small set of interest topics from a user's recent browsing, kept on the device, and shares a few of them with sites and ad tech callers as a coarse targeting signal in place of third-party-cookie profiling. Adoption was limited and Google announced its retirement in October 2025; it remains a reference point for what browser-mediated interest targeting looks like.
Cite this entry:
Agency Echelon. "Topics API." Agency Echelon Reference, reviewed October 2026. https://agencyechelon.com/reference/glossary/topics-api/