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Setting Cookies: When a user visits a website, it may include third-party ad service code. This code instructs the ad server to deliver an ad to the user's browser while also including a command to set a cookie. This cookie is stored on the user's browser, not directly by the visited website but by the ad server, hence termed a third-party cookie.
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Collecting Information: Once this cookie is set on the user's device, it stores information such as the user's unique identifier, visited pages, and clicked ads. Whenever the user visits other websites containing the same third-party ad code, the ad code on those sites can read the cookie and transmit the visit data back to the ad server.
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Data Integration: The ad server collects this data from multiple websites and integrates it into a user behavior profile. This profile encompasses the user's browsing habits, interests, and potential shopping behavior.
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Ad Targeting: Based on this collected and integrated data, ad companies can more accurately identify the user's interests and needs. They can then serve highly targeted ads when the user visits other websites, which align better with the user's interests, thereby increasing click-through rates and ad effectiveness.
Example: Suppose you frequently visit travel-related websites and search for information about "Japan travel". Ad companies using third-party tracking cookies can recognize your interest in Japan travel and display ads for Japan hotel deals and travel group discounts when you visit other websites.
In summary, third-party tracking cookies are a powerful tool for enhancing ad relevance and effectiveness, yet they have also ignited widespread discussions about privacy and the use of user data.