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Socket.io
Socket.io is a Node.js library made to help make real-time communication between computers possible. To ensure this Socket.io uses a combination of WebSockets and Polling to establish a connection between the client's browser and the server. This allows it to work on older browsers that may not support pure websockets. This library uses Engine.IO for building the connection.
Demos
To get a taste of what is possible, Socket.io provides two demos to show it's possible use-cases. You can find the demos at https://socket.io/demos/chat/ and find the link to the whiteboard demo on the left.
Get Started
Since Socket.io is a Node.js library, you have to make sure that Node.js is installed on your computer. If it's not set up yet get the latest version at Nodejs.org
macOS
Node.js can also be installed via Homebrew a package manager for macOS.
Just type brew install node to install Node.js.
A get started guide can also be found on Socket.io's page. It shows how to easily build a real-time chat in just a couple of lines.
More information
More information about Socket.io and it's documentation can be found at: