They allow advertisers and other entities to track user behavior across multiple websites, building detailed profiles of interests and online activities.

Third parties can collect extensive information about users without their full awareness or consent.

Information gathered through these cookies may be sold or shared with other companies or data brokers.

Users often don't know which third parties are collecting their data or how it's being used.

Collected data could be used for price discrimination, manipulation of user choices, or even identity theft if not properly secured.

Data collected may be stored indefinitely, creating a persistent digital footprint.

When combined with other technologies, third-party cookies can be used to track users across different devices.