Question

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What is node.js?
Usages of Node.js – What obstacles is it aiming to provide a ramp for?

What is the correct scenario to use server side javascript? like node.js
What kind of problems it solves?

Answer 1

• Node.js solves the problem of serving many concurrent users from I/O based servers.
• By I/O I mean that little to none computation is done in the request response cycle from the
  server part.
• By concurrent I meany that thousands of users can keep a connection open with the server.
• Having a persistent connection allows real time communication, the server can push over the opened connection, in a sense this way the server can be thought of as initiating the communication (comet, server push).

All this allows having a large user-base with little server resources and real-time communication (chat etc).