Google Discover

Google Discover is a push technology that (as of 2020) is central to Google’s drive to become an assistive engine.

Simply put, it tracks what users interact with online then, through Google Search, Chrome and Android it pushes content that it sees as related and appropriate to that user.

Here is Google’s take

Discover is an updated Google feed experience that keeps you inspired and informed about the interests and hobbies you care about most.