React is a front-end and open-source JavaScript library which is helpful in building UI components specifically for single-page applications. 
It is useful and creating complex and reusable UI components or views for mobile and web applications. 
Some important features of Reacts are:
<ol>
<li>React supports server-side rendering.</li>
</ol>
<ol>
<li>React uses Virtual DOM rather than Real DOM for rendering components, as Real DOM Manipulations are expensive.
</li>
<li>React follows uni-directional data flow or data binding.
</li>
<li>It uses a reusable component approach for building UI or view.
</li>
</ol>

React is a front-end and open-source JavaScript library which is helpful in building UI components specifically for single-page applications.  
  
It is useful and creating complex and reusable UI components or views for mobile and web applications.  
  
Some important features of Reacts are:

1. React supports server-side rendering.
    

1. React uses Virtual DOM rather than Real DOM for rendering components, as Real DOM Manipulations are expensive.
    
2. React follows uni-directional data flow or data binding.
    
3. It uses a reusable component approach for building UI or view.

Day 1: What is React?