JavaScript is a programming language that adds interactivity to web pages. It's used to create dynamic content, like animated graphics, interactive maps, and scrolling video jukeboxes. JavaScript is a key part of web development, along with HTML and CSS. Here are some things to know about JavaScript: How it works JavaScript is a versatile language that supports both object-oriented and functional programming. It's based on the syntax of Java and C, and many structures from those languages apply to JavaScript. How it's used JavaScript is used to create dynamic web pages, which are pages that update automatically without requiring a browser refresh. How it's built JavaScript is built into web browsers and runs on computers, tablets, and smartphones. How it's extended JavaScript can be extended in two ways: client-side and server-side. Client-side extensions let applications respond to user events, while server-side extensions let applications communicate with databases and perform file manipulations. Who invented it