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jQuery is a JavaScript framework designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.[3] It is free, open-source software using the permissive MIT License.[4] As of Aug 2022, jQuery is used by 77% of the 10 million most popular websites.[5] Web analysis indicates that it is the most widely deployed JavaScript library by a large margin, having at least 3 to 4 times more usage than any other JavaScript library.[5][6]

Quick facts: Original author(s), Developer(s), Initial rel...
Original author(s)John Resig
Developer(s)The jQuery Team
Initial releaseAugust 26, 2006; 16 years ago (2006-08-26)
Stable release
3.7.0 / (May 11, 2023; 14 days ago (2023-05-11))[1]
Written inJavaScript
PlatformSee § Browser support
Size27–274 KB[2]
TypeJavaScript library

jQuery's syntax is designed to make it easier to navigate a document, select DOM elements, create animations, handle events, and develop Ajax applications. jQuery also provides capabilities for developers to create plug-ins on top of the JavaScript library. This enables developers to create abstractions for low-level interaction and animation, advanced effects and high-level, theme-able widgets. The modular approach to the jQuery library allows the creation of powerful dynamic web pages and Web applications.

The set of jQuery core features—DOM element selections, traversal, and manipulation—enabled by its selector engine (named "Sizzle" from v1.3), created a new "programming style", fusing algorithms and DOM data structures. This style influenced the architecture of other JavaScript frameworks like YUI v3 and Dojo, later stimulating the creation of the standard Selectors API.[7]

Microsoft and Nokia bundle jQuery on their platforms.[8] Microsoft includes it with Visual Studio[9] for use within Microsoft's ASP.NET AJAX and ASP.NET MVC frameworks while Nokia has integrated it into the Web Run-Time widget development platform.[10]