JavaScript is a versatile, high-level programming language primarily used in web development to create interactive and dynamic web pages. It runs on the client side of the web, allowing scripts to interact with the content of a webpage in real time. JavaScript is an integral part of the web, enabling functionalities like form submissions, animations, updating content asynchronously, and much more. It's a core technology of the World Wide Web, alongside HTML and CSS, and is supported by all modern web browsers without the need for plugins.
