A third-party cookie is a tracking cookie used in web browsers to collect data about a user’s browsing behavior across multiple websites, even if the user is not directly interacting with those third-party websites. Advertisers, marketers, and analytics companies have widely used these cookies to gather information about users’ interests, habits, and preferences. Companies utilize this data for serving targeted ads, personalizing content, and gauging the effectiveness of advertising campaigns.

Domains other than the one a user visits typically set third-party cookies. For example, if you’re on “Website A,” which embeds content from “Third-Party Domain B” (such as an ad, social media widget, or tracking pixel), cookies from Third-Party Domain B can be stored on your device. These cookies allow Third-Party Domain B to track your activity and behavior across websites that also use their services.

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