The world of Progressive Web Apps

Progressive Web Apps are the evolution of hybrid apps, i.e. interactive mini sites that behave like native apps of the platform. You can therefore to say that PWAs are web applications that progressively (hence the name) become equivalent to native apps.

They are essentially apps that can be used without the constraints of browser stores, as they must be usable regardless of Chrome, Safari, Internet Explorer-Edge or Firefox, so as not to discriminate between users and platforms. They can be easily shared, linked, placed on the home screen and all without going through the app store.

A more authoritative detail can be found here. find here