JSX (JavaScript XML) is a syntax extension for JavaScript used in React to describe the UI structure. It allows developers to write HTML-like code directly within JavaScript, making the code more readable and expressive.

Key Features:

• HTML-like Syntax: JSX resembles HTML, but it’s actually JavaScript code, making it easy to understand and work with.
• Component Representation: Defines React components’ structure, mixing HTML tags and JavaScript expressions.
• JavaScript Integration: You can embed JavaScript expressions inside curly braces {} within JSX.
• Transpilation: JSX needs to be compiled by tools like Babel into regular JavaScript.

JSX is a core part of React’s declarative nature, enabling developers to write cleaner and more efficient UI code.