JavaScript, often abbreviated as JS, is a scripting language from Netscape. It is lightweight and mainly used in web development as it helps to add dynamic and interactive elements to websites. It is one of the three core technologies of World Wide Web (WWW) content production.

It is a client-side or front-end scripting language, suggesting the source code is processed by the client’s web browser rather than on the web server. Nowadays, almost every website employs it, and all the modern web browsers support it without the need for plug-ins.