DOM manipulation − The jQuery makes it easy to select DOM elements, traverse them and lets modify their content by using cross-browser open source selector engine called Sizzle.
Event handling − The jQuery offers an easy and elegant way to capture a wide variety of events, such as a user clicking on a link, without the need to clutter the HTML code itself with event handlers.
AJAX Support − The jQuery helps you a lot to develop a responsive and feature-rich site using AJAX technology.
Animations − The jQuery comes with plenty of built-in animation effects which you can use in your websites.
Lightweight − The jQuery is very lightweight library – about 19KB in size ( Minified and gzipped ).
Cross Browser Support − The jQuery has cross-browser support, and works well in most of the browsers includes IE 6.0+, FF 2.0+, Safari 3.0+, Chrome and Opera 9.0+
Latest Technology − The jQuery supports CSS3 selectors and basic XPath syntax.