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Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation of a document written in a markup language.

Although most often used to set the visual style of web pages and user interfaces written in HTML and XHTML, the language can be applied to any XML document, including plain XML, SVG and XUL, and is applicable to rendering in speech, or on other media.

Along with HTML and JavaScript, CSS is a cornerstone technology used by most websites to create visually engaging webpages, user interfaces for web applications, and user interfaces for many mobile applications.

JavaScript is a high-level, dynamic, untyped, and interpreted programming language.

It has been standardized in the ECMAScript language specification.

Alongside HTML and CSS, JavaScript is one of the three core technologies of World Wide Web content production; the majority of websites employ it, and all modern Web browsers support it without the need for plug-ins.

JavaScript is prototype-based with first-class functions, making it a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles.

It has an API for working with text, arrays, dates and regular expressions, but does not include any I/O, such as networking, storage, or graphics facilities, relying for these upon the host environment in which it is embedded.

jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML.

It is free, open-source software using the permissive MIT license.

Web analysis indicates that it is the most widely deployed JavaScript library by a large margin.

In computing, Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.

The W3C's XML 1.0 Specification and several other related specifications—all of them free open standards—define XML.

Ajax (also AJAX; short for asynchronous JavaScript and XML) is a set of Web development techniques using many Web technologies on the client side to create asynchronous Web applications.

With Ajax, Web applications can send data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page.

By decoupling the data interchange layer from the presentation layer, Ajax allows for Web pages, and by extension Web applications, to change content dynamically without the need to reload the entire page.

In practice, modern implementations commonly substitute JSON for XML due to the advantages of being native to JavaScript.