JavaScript is a programming language that is commonly used to create interactive elements on websites. It is a client-side scripting language, which means that it is executed by the web browser on the user's computer, rather than on the server.
JavaScript is a popular language because it is easy to learn and can be used to create a wide range of applications, including web applications, mobile apps, and desktop applications. It is also a versatile language, as it can be used to create simple scripts or complex applications.
JavaScript can be used to create dynamic web pages that respond to user input, validate forms, create cookies, and much more. It is a key technology for modern web development, and is used by most websites to provide interactive features.