The Progressive Web Application (PWA) Addon for CS-Cart provide apps to business sites that bring mobile-app-like experiences directly onto a user's browser without requiring anyone to download the app via an app store. By doing this, it highly increases the rate of usage and conversions for businesses since, with it, one gets instant access and speeds. Here are the key features and benefits of the module:

Features:

1. Full Integration with CS-Cart & Multi-Vendor: The module will smoothly integrate with the two platforms, CS-Cart & Multi-Vendor, allowing all features of eCommerce to work as expected on mobile.
2. Customisable Application Settings: Admins can configure the application’s name, icon, splash screen background color, and theme color directly from the backend.
3. Push Notifications: Admins can compose, edit, and send push notifications. Push notifications may contain a title, a message, images, and link URL targets. For each type of notification, there can also be an individual notification banner image set.
4. User Engagement: Push notifications push the user to engage at higher levels by informing them about promotions, updates, or important information. 
5. No App Store Required: PWAs do not require the traditional app installation process, reducing barriers to entry for users who might be hesitant to download apps.
6. Works Offline and on Slow Connections: The PWA module uses service workers, which enable it to load at a much faster pace with slow or unstable internet connections.
7. User-Friendly and App-Like Interface: : The PWA is native app-like in feel and functionality, with smooth navigation and an optimised interface for mobile users. 
8. Add to Home Screen: It allows users to add the website directly to their mobile home screen, where it will work like a native app.
9. Push Notification Support on Major Browsers: The module supports push notifications on major browsers such as Chrome and Firefox.
10. Automatic Updates: Unlike native apps, PWAs don’t require users to update them manually, keeping the app always up to date.

Benefits:

1. Instant Loading and Smooth Experience: Service workers ensure that PWAs load almost instantly, even on slow networks, delivering a fast and responsive user experience.
2. Enhanced User Engagement: Push notifications re-engage the user with personalised, time-sensitive information even when the app is not open. 
3. No App Store Dependency: PWAs do not depend on an app store for installation or an update that would leave behind the legacy costs and lower access.
4. Improved Conversion Rates: The app-like experience and faster load times are likely to drive up conversion rates, particularly on mobile.

In summary, the CS-Cart PWA add-on is a tool that enhances user engagement and site performance, bringing all the benefits of a native app without the hassle of app store distribution, thus making it an essential tool for modern eCommerce stores.