Web tracking and privacy explained

Simple and precise explanations of the technologies that power web experiences, and the laws that govern them.

Cookies, Tags & Tracking

How different web technologies work.

How cookies set by external domains track users across the web.

How invisible images collect data about user behavior.

Why websites ask permission before setting cookies, and what the law requires.

The HTTP mechanism that lets a 1x1 image write persistent identifiers into your browser.

The laws and frameworks that govern data collection on the web.

How the EU and UK data protection regimes have diverged — and what it means for your website.