JavaScript is a popular programming language known for its lightweight and interpreted or just-in-time compiled features. It also has first-class functions, making it highly versatile. Although commonly used for scripting web pages, it has gained prominence in various non-browser environments like Node.js, Apache CouchDB, and Adobe Acrobat.

As a programming language, JavaScript is responsible for adding interactivity to websites. The JavaScript engine is a single-threaded language that utilizes a callback queue.

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