Introduction To React JS

React.js (commonly called React) is a popular open-source JavaScript library for building fast, interactive, and dynamic user interfaces. It was developed by Facebook in 2013 and is now maintained by Meta and a large developer community. React is especially used for single-page applications (SPAs) where data changes frequently but the page doesn’t need to reload. It works on the principle of building applications using components, making development modular, reusable, and easy to manage.

Key Features of React.js 

1. Component-Based Architecture – UI is built using reusable  components. 

2. Virtual DOM – Improves performance by updating only the changed  parts of the page instead of reloading the whole DOM. 

3. Declarative Syntax – Makes code more predictable and easier to debug. 

4. Reusable Components – Speeds up development and ensures  consistency. 

5. One-Way Data Binding – Data flows in a single direction, improving  control over applications. 

6. JSX (JavaScript XML) – Allows writing HTML inside JavaScript for  cleaner code.