Third Party Site Cookies
In August 2020, Google announced their 'Privacy Sandbox' initiative, which aims to preserve and protect user's privacy. The cookie processing change is part of this initiative. An official blog post sheds some light on it.
Google will drop support for third-party cookies in the Chrome browser in two years. Also, the company will start limiting cross-site tracking by enforcing its new SameSite rules . This has already happened in Chrome 80.
The SameSite-by-default and SameSite=None-requires-Secure behaviors will begin rolling out to Chrome 80 Stable for an initial limited population starting the week of February 17, 2020.