The primary purpose of Javascript / JQuery is client side processing, as opposed to sending everything back to the server via HTML for processing on the server. They can do not only input validation but more complex processing in response to user input, all right there at the client.

>Thank you for the link to jquery docs. I will go and read. But what I don't understand (and I am sure it is obvious to you) is what specifically jquery does for me. Say I want the application be a simple data entry form (bunch of text boxes and drop down controls and a Submit button). I don't understand service JQuery provides in this case. Although maybe because I also need a menu, the menu has to be built with JQuery?
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>>The template will not tell you how to use JQuery. JQuery is an open source wrapper for javascript that makes things much, much easier. Look here for help http://docs.jquery.com/. The docs are pretty good.
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>>>I will download the VS Express and see how the Mobile template works. I definitely don't want to go the MVC route. And hopefully the template will explain how to use the jquery (cause I never used it) and allow me the flexibility of making the screen per my spec.
>>>Thank you.