libuv, The Event Loop, and Non-Blocking Asynchronous Execution

Big Word

Asynchronous: More than one process running simultaneously

Node does things asynchronously. V8 does not.

Synchronous: One process executing at a time

Javascript is synchronous. Think of it as only one line of code executing at a time.

NodeJS is asynchronous.

Non-Blocking: Doing other things without stopping your programming from running.

This is made possible by Node's doing things asynchronously.