Progressive Web App (PWA)
A Progressive Web App (PWA) is a website that behaves like a native app – installable on the home screen, able to work offline and able to send push notifications – while still remaining an ordinary website reachable via a URL.
In practice
A PWA is worth it above all for content or tools that people return to regularly. Genuinely good, app-like behaviour requires real development effort, however, which makes it worth weighing up the benefit carefully in advance.