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<div>
    <h2>
        Introduction:
    </h2>
    <p style="color:red;">
    <h3>Node.js</h3>
    &nbsp;  &nbsp;  &nbsp;
    Nodejs is an open source , cross platform , JavaScript runtime environment  which is based on  <a href="https://developers.google.com/v8/"> Chrome's V8 JavaScript engine</a>.
    <br>
    Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.<br><br>

    It is used to develop scalable, real-time , network and server-side applications written in javascript and we can run that applications within Node.js runtime environment  on Mac OS X ,Windows ,Linux ,solaris and BSD.<br><br>

    Node.js provides an event-driven architecture and a non-blocking I/O API designed to optimize an application's throughput and scalability for real-time web applications. It uses Google V8 JavaScript engine to execute code, and a large percentage of the basic modules are written in JavaScript. Node.js contains a built-in library to allow applications to act as a web server without software such as Apache HTTP Server, Nginx or IIS.<br><br>

    Node.js can be combined with a browser, a document database (such as MongoDB or CouchDB) and JSON for a unified JavaScript development stack.<br><br>

    According to wikipedia,

    Node.js is used by IBM, Microsoft, Yahoo!, Walmart, LinkedIn, Rakuten, PayPal and GoDaddy .

    </p>

    <p>
        <h3>npm</h3>
    &nbsp; &nbsp; &nbsp;

    npm is the pre-installed package manager for the Node.js server platform. It is used to install Node.js programs from the npm registry, organizing the installation and management of third-party Node.js programs.
    </p>
</div>