Business Insider/Google
That vision is a "mesh" network, where you have multiple units that actively communicate with each other to provide a strong, fast WiFi signal throughout your home instead of a single WiFi router, which might not reach that deepest, darkest WiFi dead zone.
Up until the advent of mesh networking, most of us would use WiFi extenders to extend WiFi signals to our dead zones, but they're not very good. They cut our advertised internet speeds in half, and most require you to reconnect from main router to extender while moving around the house.
Most mesh WiFi systems are pretty expensive, but Google's is the cheapest by far.
So, how well does a home networking system from one of the most valuable names in tech work? See for yourself: