In January 2020, Google announced its plans to phase out support for third-party cookies in Chrome (accounting for more than 65% of the global internet browser market share) by 2022.
In June 2021, the company initially postponed the shift to 2023 and again a few days ago to 2024, giving companies and publishers more time to adapt. This means that from 2024 onwards all major browsers (Google Chrome, Firefox, Safari) will block the use of third-party cookies.
Third-party cookies are placed by sites other than the one that the user is directly interacting with, most typically when an advertisement is displayed on the page but also through the use of invisible tracking pixels and other means. They are used for sharing user’s information between different sites, retargeting and tracking user behaviour across any site where the third-party server places ads.