For real-time web applications, Socket.IO is an event-driven library. It is based on the WebSocket protocol and offers extra assurances like a fallback to HTTP long-polling or immediate reconnection.
In 2010, Socket.IO was developed. Real-time communication, which was still a relatively new concept then, was made possible using open connections. Both client and server interaction is made possible today through Socket.io.
It depends on Engine.IO, which first attempts to upgrade to more advanced "testing" transports like WebSocket before establishing a long-running polling connection.
Until the server is back up, the disconnected client keeps attempting to connect.
Engine.io serves as the socket.io's beating heart. When no one else replies, it informs the server and the client.
With the help of Socket.IO, you can split your application's concerns into different namespaces that will function as distinct communication channels while still using the same underlying connection.
Additionally, it permits the emission of any serializable binary data, such as ArrayBuffers, Blobs & more.
It is simple to send an event and get a response with the acknowledgments of Socket.io.
With debugging, a simple but incredibly potent tool, Socket.IO is now fully instrumented.
Microsoft Office, Zendesk, Trello, and several other companies use Socket.IO to create reliable real-time solutions.
Being an open-source, cross-platform framework, Socket.IO offers full-duplex, bidirectional interaction between a client and a server based on events.