Given the comparison to Pusher and Ably, it looks like it’s an HTTP<>WebSocket bridge. Deploying WebSockets in production systems is tough because they use long-lived connections. Companies like Pusher solve this by serving the long-lived connections on their infrastructure, and relaying messages to your server over webhooks.
It’s used for things like notifying users when they get a DM, or displaying live sports scores.
It’s used for things like notifying users when they get a DM, or displaying live sports scores.