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1.
A FAR superior JavaScript framework that makes ASP.NET AJAX and its proponents feel like little bitches.
Tom, WTF is the matter with you?! Use jQuery or DIE....bitch!
by Matt!!!!!!!!!!!!!! April 09, 2008
 
2.
A javascript library inferior to the ASP.Net AJAX libraries in every way.
Seriously, Matt, don't use jQuery. Ever.
by Anonymous(Tom) April 08, 2008
 
3.
A javascript library written by John Resig. Its intent is to make DOM querying and manipulation easier. It removes the pain of cross-browser compatibility issues.
var myspan = $("#myspan"); //using jQuery

instead of,

var myspan = document.getElementById("myspan"); //standard and drawn out way
by Toady111222 March 11, 2009