35 React Interview Questions and Answers Introduction React is one of the most popular JavaScript libraries for building user interfaces. Whether you're preparing for a job interview or just want to deepen your understanding, this guide covers 100 commonly asked React interview questions with answers. 1. Basic React Questions 1. What is React? React is an open-source JavaScript library developed by Facebook for building fast and interactive user interfaces, particularly single-page applications. 2. What are the main features of React? JSX (JavaScript XML) Virtual DOM One-way data binding Component-based architecture High performance 3. What are components in React? Components are independent, reusable pieces of UI in React. They can be functional or class-based. 4. What is JSX? JSX is a syntax extension of JavaScript that allows you to write HTML inside JavaScript. jsx const element = < h1 > Hello, world! </ h1 > ; 5. What is the Virtual DOM? The Virtual DOM is a lig...