Google Chrome

Dominant global browser with ~65% market share, serving as the de facto standard for web-based advertising infrastructure and privacy policy

Google Chrome is Google's web browser, first released in 2008, and has grown to command approximately 65% of the global browser market share, making it the most widely used browser in the world. As the platform through which billions of users access the internet, Chrome occupies a uniquely powerful position in the digital advertising ecosystem — its technical decisions directly determine how advertisers, publishers, and ad tech vendors can track users, serve ads, and measure campaign performance. Chrome's significance in AdTech stems primarily from its role as the gatekeeper for third-party cookies and its stewardship of the Privacy Sandbox initiative. Google announced plans to deprecate third-party cookies in Chrome, a decision that sent shockwaves through the entire AdTech industry, as third-party cookies have been the foundational tracking mechanism for decades. While the timeline has been repeatedly delayed and ultimately revised — with Google announcing in 2024 that it would not deprecate cookies but instead offer users a choice — the Privacy Sandbox APIs (including Topics API, Protected Audience API, and Attribution Reporting API) remain active development priorities. For publishers, advertisers, DSPs, SSPs, DMPs, and measurement vendors, Chrome's technical architecture is not merely a browser concern — it is a core business constraint. Changes to Chrome's cookie policies, storage partitioning, fingerprinting protections, and API availability directly impact revenue models, targeting capabilities, and attribution methodologies across the entire open web. Chrome is effectively a regulatory and infrastructure force in AdTech, rivaling the influence of any single ad platform.