Progressive Web Apps are user experiences that have the reach of the web, and are:
Reliable – Load instantly and never show the downasaur, even in uncertain network conditions.
Fast – Respond quickly to user interactions with silky smooth animations and no janky scrolling.
Engaging – Feel like a natural app on the device, with an immersive user experience.
This new level of quality allows Progressive Web Apps to earn a place on the user’s home screen.
more at https://developers.google.com/web/progressive-web-apps/