JavaScript is a scripting language that is used for developing web pages. It is a lightweight and easy to learn language that is compatible with many browsers. JavaScript is a lightweight, easy to learn, and cross-browser compatible scripting language. JavaScript is most commonly used for web development, though it can also be used for other things like data manipulation, animation, and image processing. It was first introduced in 1995 by Brendan Eich, the creator of the programming language.