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Node.js 


                   -Developed by Ryan Dahl in 2009

                 
                  -Open source server environment. 


                  -Runs on different platforms such as Windows, Linux, Unix and                                                 Mac OS 

                  -Generate dynamic pages

                  -Add, delete, update and edit data in database

                  -files use extension ".js"




Node.js is best for event based real time applications such as game servers, advertisement servers and streaming servers.


With Node.js web applications can have a real-time, two-way connections, where both the client and server can initiate communication, allowing them to exchange data freely and also to maintain the session information between requests for a user.




Advantages and disadvantages in Node.js




Advantages

          -Easily extensible.


          -Support for common tools like unit testing.



          -Easy to scale both horizontally and vertically.



          -Ability to use single programming language.



          -Increasing the performance.



          -Support for npm





Disadvantages



          -Number of robust libraries is comparatively low.



          -API (Application Programming Interface) is not stable



          -Nit suitable for computational intensive tasks.



          -Asynchronous programming model is complex.



          -Growing demand for experienced professionals.





Event Loop


Event loop allows Node.js to perform non-blocking I/O operations








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