Third-party cookies are cookies placed on domains other than that of the main site.
It is a file integrated by a site other than the one visited by the internet user, via a browser.
These cookies enable third parties to see which pages have been visited on the site in question, by a user, and to collect information about this visitor.
The aim is to follow the user's path across several websites, in particular for audience measurement or advertising purposes.
Third-party cookies therefore enable behavioural tracking across a network of sites.
What are cookies? Here is our factsheet dedicated to this subject