what is node

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                Node is a pltatform built on V8 which is already used by Google crome.It was created by Ryan Dahl.In order to execute javascript,
             Node is a platform for writing serverside javascript for writing scalable internet applications where as Javascript is for writing client side script.It was created by Ryan Dahl.
Every function in node is Asynchronous,nonblocking i/o.
Node applications uses asynchronous event driven model.

Node consists of lots of modules and no need to write from scratch. Node is a combination of tho things, run time environment and a library.