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1. jquery
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!
2. jquery
A javascript library inferior to the ASP.Net AJAX libraries in every way.
Seriously, Matt, don't use jQuery. Ever.
3. jQuery
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
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