Can you explain the concept of Virtual DOM and how it is used in React? What are the differences between state and props in React? How would you handle asynchronous operations in React? Can you explain the purpose of React Router and how it is used? What is the significance of key props in React lists? How do you manage state in React? Explain the useState hook. What are React lifecycle methods? Can you describe their purpose and usage? How would you optimize the performance of a React application? Can you explain the concept of controlled components in React? How does React differ from other JavaScript frameworks like Angular or Vue?