React is a JavaScript library for building user interfaces, particularly for single-page applications. It allows developers to create large web applications that can change data without reloading the page.

Components are the building blocks of any React application. They can be classified into:

• Class Components
• Functional Components

Example of a functional component:

const MyComponent = () => {
                return 
Hello, World!
;
            };

JSX (JavaScript XML) is a syntax extension for JavaScript that looks similar to XML or HTML. It is used to describe what the UI should look like.

Example of JSX:

const element = <h1>Hello, World!</h1>;

Props (short for properties) are used to pass data from one component to another. State is a built-in object that holds the component's dynamic data and determines how that component renders and behaves.

Example of using props:

const Greeting = (props) => {
                return <h1>Hello, {props.name}</h1>;
            };

Lifecycle methods are hooks that allow you to run code at specific points in a component's life. They include:

• componentDidMount
• componentDidUpdate
• componentWillUnmount

Hooks are functions that let you use state and other React features without writing a class. The most commonly used hooks are:

• useState
• useEffect

Example of useState:

const [count, setCount] = useState(0);

Example of useEffect:

useEffect(() => {
                document.title = \`Count: ${count}\`;
            }, [count]);