🔥 React Interview Questions 2025 | What Are State & Props in React?

Are you preparing for a React.js or MERN Stack interview in 2025? In this video, I explain two of the most fundamental and commonly asked topics in React: State and Props. Whether you're a beginner, a fresher, or a developer with 1–2 years of experience, these concepts are crucial for clearing React and frontend interviews. This video covers what State is, why React uses it, how Props work, the differences between them, and real interview examples. 🔥 Topics Covered in This Video 1️⃣ What Is State in React? State is a built-in object that stores dynamic data The component re-renders when state changes State is mutable State is private to the component Updating state using useState Real examples: counter, toggle button, form inputs 2️⃣ What Are Props in React? Props (properties) are passed from parent to child Props are read-only Used to pass data, functions, arrays, and objects Helps create reusable and dynamic components Props improve modularity and clean UI structure 3️⃣ Difference Between State and Props (Interview Answer) State: mutable, internal to the component Props: immutable, external data passed down State causes re-render, props allow communication State is used for interactive UIs, props are used for sharing data 📘 Notes for Viewers 📍 State in React Stores dynamic values Changes over time Triggers UI updates Declared using useState: Example: const [value, setValue] = useState(0) 📍 Props in React Passed from parent to child Read-only Makes components reusable Example: Child component receives name = "Puja" 📍 State vs Props (Quick Comparison) Feature State Props Mutability Mutable Immutable Source Inside component Parent component Re-render Yes No (unless parent re-renders) Usage Store data Pass data 🎯 Ideal For ✔ React beginners ✔ MERN stack developers ✔ Frontend job seekers ✔ Students preparing for interviews ✔ Anyone learning React fundamentals State in React explained Props in React explained React interview questions 2025 Difference between state and props React state and props tutorial What are props in React React useState hook React basics for beginners MERN stack interview preparation React components interview questions Frontend developer interview questions React props vs state React fundamentals React for freshers #React #ReactJS #ReactInterviewQuestions #ReactState #ReactProps #LearnReact #MERNStack #FrontendDeveloper #ReactTutorial #JavaScriptInterview #FrontendInterview #ReactForBeginners #WebDevelopment #CodingInterview #SoftwareDeveloper