JSX is a syntax extension to JavaScript that allows you to write HTML-like structures within your JavaScript code. It's primarily used with React, a popular JavaScript library for building user interfaces. JSX makes it easier to create and manage dynamic UI elements by embedding HTML directly into JavaScript components. This allows developers to describe the desired UI structure in a declarative way, making the code more readable and maintainable. The JSX code is then transformed into regular JavaScript function calls that create the actual DOM elements. While JSX looks like HTML, it's important to remember that it's not directly interpreted by browsers. Instead, it needs to be transpiled into standard JavaScript using tools like Babel. JSX simplifies the process of building complex UIs by providing a more intuitive and expressive syntax for defining UI components and their structure. It also enables features like component composition and data binding, which are essential for building modern web applications. Furthermore, JSX helps to prevent cross-site scripting (XSS) attacks by automatically escaping values injected into the HTML structure.