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Top 5 React interview questions… asked in 2026. If you’re preparing for React interviews… don’t skip this video. Watch till the end… because I’ll share one killer question… that most developers fail. Let’s start. What is React? “React… is a JavaScript library… used to build user interfaces. It follows a component-based approach… which means… we divide the UI into small… reusable pieces. These are called components. React also uses something called… the Virtual DOM… to make updates faster.