A Progressive Web App (PWA) is a web application that behaves like a native mobile app. PWAs can be installed on a user’s device, work offline, and send push notifications—all through standard web technologies.

Key features:

• Responsive: Works across devices.
• Installable: Users can “add to home screen.”
• Offline support: Thanks to Service Workers.
• App-like feel: Runs full-screen with no browser UI.
• Secure: Served over HTTPS.

Core technologies:

1. Service Worker
   • JavaScript file that intercepts and caches network requests.
2. Web App Manifest
   • JSON file that defines the app’s name, icons, and display behavior.
3. HTTPS
   • Required for service workers and security.

Example manifest:

jsonКопироватьРедактировать{
  "name": "My PWA",
  "start_url": "/index.html",
  "display": "standalone",
  "icons": [{
    "src": "/icon.png",
    "type": "image/png",
    "sizes": "512x512"
  }]
}

Benefits:

• No app store required.
• Faster load times and offline functionality.
• Can re-engage users via push notifications.

PWAs combine the reach of the web with the capabilities of mobile. They’re perfect for startups, e-commerce, and content platforms looking to deliver fast, app-like experiences without native development costs.