Node_js_basic.js

Q1) What is node.js?
 sol - The nodejs is runtime enviornment for Javascript

Q2) How Node is a runtime environment on server side ?  what is V8 ?

Q3) What is difference between runtime environment and framework ? 
  sol - Runtime enviornment primarly focuses on providing the necessary infrastructure for code execution , including services like memory management andI/O operation
   Framework primarly focuses on simplifying the development process by offering a structured set of tools, libraries and best practices

Q4) What is difference between node.js and express.js ?
express.js is a framework built on the top of node.js.It is designed to simplify the process of building web applications and APIS and providing a set of fetaures like simple routing system, middleware support etc.

Q5) What are the differences between client side and server side ?