Browser cookies are small text files stored on your device that facilitate communication between your browser and web servers. They serve various purposes from session management to tracking user behavior across the internet.

Types of Cookies Explained

First-party vs. third-party cookies: First-party cookies are set by the website you are visiting. Third-party cookies are placed by external domains and are considered far more invasive, as they allow cross-site tracking of user behavior.

Essential vs. non-essential cookies: This is the most important legal distinction. Essential cookies are strictly necessary for a website to function (such as login sessions or shopping carts). Non-essential cookies, including those used for analytics and advertising, always require explicit user consent under European law.

Unique vs. non-unique cookies: Cookies that contain unique identifiers qualify as personal data under the GDPR, triggering additional regulatory requirements.

Under the ePrivacy Directive (Article 5(3)), non-essential cookies require informed, opt-in consent before they can be placed on a user's device. Essential cookies are exempt from this requirement as they are strictly necessary for the requested service.

When a cookie serves multiple purposes and any one of those purposes is non-essential, consent is required for the entire cookie. Passive or pre-checked consent mechanisms do not satisfy legal requirements.

Mobile App Tracking

The same consent rules technically apply to mobile app tracking, but enforcement in the app ecosystem has been notably lacking. Many software development kits (SDKs) embedded in apps contain extensive tracking capabilities that frequently bypass consent requirements.

Cookies in Web Analytics

Traditional cookie-based analytics platforms collect detailed behavioral data but at a significant privacy cost. In the European Union, strict consent requirements have led to high opt-out rates, creating substantial data gaps. Cookieless analytics approaches have emerged as an alternative that can operate without requiring cookie consent banners.