jQuery is a lightweight JavaScript library, made by John Resig.
From jQuery.com:
jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.
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Syntax[]
$(function() {
$("element").method();
$("element").method(function(param) {
$("element").method(param);
});
})