What is a PWA (aka Progressive Web App)?
First of all, I applaud your curiousity! This website is a Progressive Web Application, which means you can add it to the home screen of your phone or tablet and interact with it as you would a native app (an app you downloaded from the App Store or Google Play, for example). Once it is installed, you can receive push notifications and use many, if not all, of its other features while offline.
