What is Pusher and what is it used for?
Pusher is a real-time messaging and notification infrastructure for web and mobile applications, with two main products: Pusher Channels, for WebSocket events, and Pusher Beams, for push notifications.
In Pusher Channels, the application server publishes events to named channels and Pusher delivers those messages to subscribed browsers and apps, so the team does not run WebSocket infrastructure. Channels can be public, private (authorization is required to subscribe), presence (they show who is online) or encrypted. When a device does not support WebSocket, the service falls back to HTTP.
Pusher Beams sends push notifications to iOS, Android and web, targeted at authenticated users or at groups of devices by interest.
It is used for instant updates in dashboards, activity feeds, collaboration, notifications and games. Pusher has belonged to the MessageBird group, now called Bird, since 2020.






