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JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive, enabling features like animations, clickable controls, and popup menus. It runs inside a host environment (most commonly a web browser) where it can connect to objects such as the Document Object Model (DOM) to control page behavior and respond to user events. Beyond the browser, JavaScript can also be used on the server through technologies such as Node.js, allowing websites to do more than serve static files—for example, handling realtime collaboration and responding to custom requests from code running in the browser. JavaScript includes a standard library (e.g., Array, Map, Math) and core language elements (operators, control structures, statements), and it can be extended with environment-specific objects for client-side (browser/DOM control) and server-side (database communication, persistence, and file manipulation) capabilities.
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Client-side JavaScript extends the core JavaScript language with browser-specific objects and APIs that enable scripts to control webpages and their Document Object Model (DOM). Through these capabilities, JavaScript can modify HTML elements, update page content and appearance, create or remove form elements, and respond to user events such as mouse clicks, form input, and page navigation. The DOM exposes HTML document objects to JavaScript and is standardized separately from the ECMAScript language specification by organizations such as the W3C and WHATWG. Modern browsers provide a JavaScript console for testing scripts directly on the current page, making it useful for exploring DOM manipulation and browser behavior. JavaScript runs dynamically in the browser, using objects, functions, and event handling to create interactive web experiences.
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