JavaScript is a high-level programming language that is commonly used to create interactive web pages and web applications. It is a client-side scripting language, which means that it runs on the user's computer rather than on the server. JavaScript is often used in conjunction with HTML and CSS to create dynamic and responsive web pages. It is a versatile language that can be used for a wide range of applications, from simple animations to complex web applications. JavaScript is supported by all major web browsers and is constantly evolving to meet the changing needs of the web development community.