Cookies

Cookies are small text files that websites store on your browser to remember information about you. First-party cookies (set by the site you're visiting) remember your login, your language preferences, and what's in your shopping cart. Third-party cookies (set by other domains, usually ad networks) track you across multiple websites to build a profile of your browsing behaviour for targeted advertising.

The cookie landscape has undergone a massive transformation. GDPR, CCPA, and other privacy regulations now require websites to get explicit consent before setting non-essential cookies. Safari and Firefox already block third-party cookies by default, and Chrome has been phasing them out. This shift has forced the entire digital advertising industry to develop new approaches to targeting and measurement.

For marketers, the decline of third-party cookies means a fundamental shift toward first-party data strategies. This includes encouraging users to create accounts, building email lists, implementing server-side tracking, and using privacy-preserving measurement approaches like Google's Privacy Sandbox. Brands that have strong direct relationships with their audience are far less affected than those who relied entirely on third-party cookie targeting.

The irony of cookies is that they were originally a simple convenience feature - invented in 1994 to let a website remember a user's shopping cart. Three decades later, they've become the centre of a global privacy debate that's reshaping the entire internet advertising ecosystem.