# React Interview Questions

A list of React interview questions:

1. What is React? Explain its key features.
    
2. What is JSX in React? How does it differ from HTML?
    
3. What is the virtual DOM in React?
    
4. What is the significance of key props in React?
    
5. What is the purpose of the state in React?
    
6. What is the difference between props and state in React?
    
7. What are React components? Explain the different types of components.
    
8. What is a functional component? How is it different from a class component?
    
9. How do you create a stateful component in React?
    
10. Explain the concept of React hooks. Provide examples of some commonly used hooks.
    
11. What is the significance of the use effect hook in React?
    
12. What is the purpose of the setState method in React?
    
13. What are controlled components in React?
    
14. How do you handle forms in React?
    
15. Explain the concept of conditional rendering in React.
    
16. What is the purpose of the React Router library? How do you implement routing in React?
    
17. What are React context and why would you use it?
    
18. How can you optimize the performance of React components?
    
19. What are React fragments and why are they used?
    
20. What is the significance of React keys when rendering lists?
    

React is a powerful JavaScript library for building user interfaces. It offers a component-based approach, a virtual DOM for efficient rendering, and a declarative syntax through JSX. Understanding the core concepts of React, such as components, state, props, and hooks, is crucial for developing robust and scalable applications.