JavaScript is a versatile programming language primarily used for web development. It allows for interactive elements on web pages, enabling functionalities like dynamic content updates, user interaction, and much more. Originally developed to add interactivity to static HTML pages, it has evolved into a powerful language used both on the client-side (in web browsers) and server-side (with platforms like Node.js).
JavaScript is known for its flexibility and compatibility across different web browsers. It's a crucial component in modern web development, used for creating web and mobile applications, games, server applications, and even in the development of Internet of Things (IoT) devices.