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ExpressJS                   - Is a web application framework for Nodejs                   - Discharged as free and open source computer program                              under the MIT Permit                   - Is outlined for building web applications and APIs                   - Provides a robust set of features for web and mobile                                     applications                   - Developed ans maintained by the Node js foundation                   - High performance, extensible and reusable   Ho w to start developing and using the Express Framework. You should have the Node and the npm (node package manager) installed . Confirm that node and npm are installed by running the following commands in terminal.                           node --version                           npm -- version Start your terminal/cmd, create a new folder Now to create the package.json file using npm                            npm init

React                -Is a java script library for build user interfaces.               -Used to create single page applications.               -Allows us to create reusable UI components.               -Every component in react goes through a life cycle of  events.               -Developed and maintained by Facebook and  Instagram.               -Acts as view in MVC architecture.               -Classes are considered as components.               -Simplicity and aim to performance are main benefits.                                              Main features in React (01)One way data flow Data flows parent component to child component only. But action flows from child component to parent component only. (02)Virtual DOM React maintain a virtual DOM. Continuously monitoring users actions. Only the changed element re enter. (03)JSX JavaScript XML. HTML like syntax. Prevents cross site attacks. -----------------------------------------