If you’re not familiar with web development, this all sounds pretty complicated. But in a nutshell, the change should help boost privacy and security for Chrome users. Websites that use cookies to track users movements across different websites, as well as affiliate revenue schemes could be broken by the change.
Google is giving developers some time to adapt to the new changes, which won’t be enabled in the new version of Chrome until the end of the month.
It’s possible some cross-website tracking – for example, Facebook uses cookies within the Login With Facebook buttons that are scattered across a huge swathe of websites to keep tabs on your movements and the types of websites that you like to visit, even when you’re not logged in – could be stopped by the new update.