🟦 Top 15 React Interview Questions for 1–2 Years Experience Preparing for a React interview with 1–2 years of experience? Here's a carefully curated list of 15 important React questions with clear, real-world answers. These are frequently asked in interviews at companies like TCS, Infosys, Cognizant, Capgemini, and product-based firms. Q1. What is the Virtual DOM in React, and how does it improve performance? Answer: The Virtual DOM is a lightweight, in-memory copy of the real DOM. When state/props change, React creates a new Virtual DOM tree, compares it with the old one (diffing), and only updates the parts of the real DOM that changed. This makes rendering much faster and improves performance in large applications. Q2. What is JSX in React? Answer: JSX stands for JavaScript XML. It allows us to write HTML elements in JavaScript and place them in the DOM without using createElement() . JSX improves code readability and is transpiled to React.createElement() calls. ...