Lifecycle methods are built-in functions like componentDidMount, shouldComponentUpdate, and componentWillUnmount that allow class components to run code at specific points in the component's life. They are similar in purpose to Hooks in functional components.

React JS is a declarative, efficient, and flexible open-source JavaScript library developed by Facebook for building user interfaces, particularly for single-page applications.

Higher-order components are functions that take a component and return a new component with additional props. They are used to share common functionality across components.

React Suspense is a feature that lets you wait for some code to load and declaratively specify a loading state (e.g., a spinner) while waiting. It is commonly used with React.lazy for code-splitting.

React Fragments (<></> or <React.Fragment>) let you group a list of children elements without adding extra nodes to the DOM. They help keep the DOM tree clean and improve performance in React applications.

The Context API is a way to share values like state across your component tree without having to explicitly pass props through every level of the tree.

React is a JavaScript library for building user interfaces for web applications, while React Native is a framework for building native mobile applications using React.

In React JS, forms are typically handled using controlled components, where the form data is managed by the component's state. The onChange handler updates the state, and the input's value is bound to the state variable.

Prop drilling is the process of passing data from parent components to child components through props. It can become cumbersome in deeply nested components, and can be mitigated using the Context API or state management libraries like Redux.

React.lazy() is a function that enables dynamic import of components. It allows you to render a dynamic import as a regular component.

 Redux is a predictable state container for JavaScript apps, often used with React. It helps you write applications that behave consistently, run in different environments, and are easy to test.

React Native components are the building blocks of a React Native application. They are analogous to React components but are used to build native mobile applications.

React.memo() is a higher-order component that memoizes a component, preventing unnecessary re-renders when the props have not changed.

The Virtual DOM is an in-memory representation of the real DOM elements. React uses it to optimize updates by comparing the current and previous states and updating only the changed elements.

Keys help React identify which items have changed, are added, or are removed, improving performance in dynamic lists.

The useEffect hook lets you perform side effects in your function components. It can be used for data fetching, subscriptions, or manually changing the DOM.

Stateful components manage their own state and can change over time, while stateless components do not manage state and rely on props for data.

React Router is a standard library for routing in React applications. It enables navigation among views of various components in a React Application, allowing for dynamic routing.

JSX is a syntax extension for JavaScript that allows developers to write HTML structures in the same file as JavaScript code, making the code more readable and easier to write.

Class components use ES6 classes and can hold state and lifecycle methods, while functional components are simpler and use React Hooks (like useState, useEffect) to manage state and side effects.

Uncontrolled components are components where form data is handled by the DOM itself. They are typically used when you need to integrate with non-React code or when you don't need to manage the form data in the component's state.

Controlled components are components where form data is handled by the state within the component. The React component that renders a form also controls what happens in that form on subsequent user input.

 React components are the building blocks of a React application. They are reusable, self-contained units that define how a user interface should appear.

React Hooks are functions that allow you to use state and other React features in functional components. They were introduced in React 16.8 to enable stateful logic in functional components.

The useState hook is a function that lets you add state to your functional components. It returns an array with the current state value and a function to update it.