Why Socket.io is better than Web Socket

WebSocket is a** protocol** and Socket.IO is a** library** that uses the WebSocket protocol and provides additional functionality on top of it. So if you don't need any of the additional functionality provided by Socket.IO, it may be more appropriate to use plain WebSockets in your application.
well i will prefer to use socket.io when i need to :

1. Automatic reconnection:
   Socket.IO automatically reconnect to the server if the connection is lost, which is very important for maintaining a stable connection in unreliable network environments but with web socket you need to build this mecanisme by yourself

2. Rooms: Socket.IO provides a way to organize connections into different "rooms", which can be useful for building more complex, multi-user applications.

3. Blockers( Proxy ,firewall ,load balancer, antivirus): Socket.io connect automatically with the server even with blockers but with web socket you need to write many line of code to deal with the firewall,the antivirus, the proxy and the load balancer

4. Binary support: Socket.IO supports binary data in addition to text data but web socket can't handle binary data .

5. Cross-domain support: Socket.IO allows you to connect to a server from a different domain, which can be useful for building cross-domain applications but with web socket you need to use a reverse proxy , CORS headers

6. Fallbacks for older browsers: Socket.IO includes fallbacks for older browsers that do not support WebSockets, such as long polling and JSONP polling, which allows you to support a wider range of clients.