Fuchsia is a sort of secret Google project to redesign the operating system from scratch - with a focus of making multi-device interactions a base primative.
The goal is to make multi-device interactions easier and not dependent on pseudo HTTP initiated sockets/streams.
It’s very exciting and hopefully makes it possible to have all the devices you are working with easily work together. For example, pull up content on your phone, pass it to your TV, interact with it on your keyboard, sync with your smart watch, etc.
The opposite today would be depending on a series of memory issues or depending on browsers or socket/protocols to manage a series of interactions between devices.