The PWA works as a native app, it can run offline, despite being a web app, it has push notifications, it runs in the background, it has a splash screen when you open the app.
The main features of Progressive Web Application besides the fact that it looks like a native app is:
Progressivity
responsiveness
installable
Safety
Linkable
The performance being the web application the performance of the PWA app is usually better than the native one except in the case of apps that need to do a lot of calculations like games.
These are a little of what PWA is as it came about, some of the characteristics and permanence to know more information please see the full post on my blog, see the link below.