jQuery, The Write Less, Do More, JavaScript Library

So what exactly is jQuery?
jquery.com says:

jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development. jQuery is designed to change the way that you write JavaScript.

But let's take a look at this from a dumb man's perspective:

- it helps you make cool website interfaces like this one:
http://visionmasterdesigns.com/demo/ajaxinterface

- it can help you make cool galleries without stupid flash:
http://www.detacheddesigns.com/blog/samples/jQueryImageGallery/gallery.htm

- you can make nice handy menus with it:
http://query7.com/demos/jquerymenu.html#

- nice little image loader:
http://www.chazzuka.com/experiments/jquery-image-loader/jquery-image-loader-3.html

- nice little slide effect:
http://query7.com/demos/jquerybasicsslide.html

There are a lot of sites with tutorials for jQuery, here are some of them:
- jQuery tutorials for designers
- 15 days of jQuery
- 51 best tutorials for jQuery
- another 8 jQuery tutorials
- 35 essential jQuery tutorials
- Beginner jQuery tutorials