Websockets and SSE (Server Sent Events)

I don't even know exactly the difference between websocket and server-side event until reading these articles.

http://www.html5rocks.com/en/tutorials/eventsource/basics/
http://stackoverflow.com/questions/5195452/websockets-vs-server-sent-events-eventsource

Here is a great chart to explain that.

from YOW! Webbit - A Lightweight WebSocket Web Server in Java