Microsoft and Nokia have announced plans to bundle jQuery on their platforms. Microsoft is adopting it initially within Visual Studio for use within Microsoft's ASP.NET AJAX framework and ASP.NET MVC Framework while Nokia has integrated it into their Web Run-Time widget development platform. jQuery has also been used in MediaWiki since version 1.16.
DOM element selections using the multi-browser open source selector engine Sizzle, a spin-off of the jQuery project
DOM traversal and modification (including support for CSS 1–3)
DOM manipulation based on CSS selectors that uses node elements name and node elements attributes (id and class) as criteria to build selectors
Effects and animations
Extensibility through plug-ins
Utilities - such as user agent information, feature detection
Compatibility methods that are natively available in modern browsers but need fall backs for older ones - For example the inArray() and each() functions.
Multi-browser (not to be confused with cross-browser) support.