JavaScript is a popular programming language used primarily for creating dynamic, interactive websites and web applications. It is a high-level, interpreted language, meaning it is designed to be easy to read and write, and code is executed by an interpreter rather than being compiled into machine code. JavaScript can be used on both the front-end and back-end of web development, and is supported by all major web browsers. It is often used in conjunction with HTML and CSS to create interactive and visually appealing user interfaces. Some of the key features of JavaScript include its ability to manipulate the Document Object Model (DOM) of a web page, which allows developers to dynamically change the content and style of a page based on user input or other events. JavaScript also supports functions, which allow developers to organize and reuse code, and supports a wide range of data types, including strings, numbers, and objects. JavaScript is constantly evolving, with new features and functionality being added to the language on a regular basis. It has a large and active community of developers who contribute to its ongoing development and share knowledge through online forums, tutorials, and other resources.