Cross-Site Tracking

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Privacy Concerns
Cookies can track user behavior across sessions.

Third-party cookies enable advertisers to build detailed user profiles.

Local storage can retain sensitive data if not properly secured.

Cross-site tracking occurs when a user’s activity is monitored across multiple websites, often via third-party cookies or tracking scripts.

How It Works
Ad networks and analytics companies embed tracking codes on multiple sites.

When a user visits different sites with the same tracker, their browsing habits are recorded.

This data is used to create targeted ads or sold to data brokers.

Browser Defenses
Modern browsers like Firefox, Safari, and Chrome (with Privacy Sandbox) are limiting cross-site tracking by:

Blocking third-party cookies by default.

Implementing SameSite cookie attributes to restrict cross-origin sharing.

Introducing Tracking Protection features.

3. Web Beacons and Invisible TrackersWhat Are Web Beacons?
Also known as tracking pixels, web beacons are tiny invisible vietnam phone number list images or scripts embedded in emails and web pages. When loaded, they send data back to the server, confirming that a user opened an email or visited a page.

How They Track Users
Email Tracking: Marketing emails use beacons to detect opens, IP addresses, and device info.

Behavioral Analytics: Websites track scrolling, clicks, and time spent on pages.

Fingerprinting: Combining beacon data with browser fingerprints (screen resolution, fonts, etc.) to uniquely identify users.