Java script is a scripting language as you know. But JScript, JQuery and applications made from Java script or in other words made the java script easy to use for the user and readily available. I hope i am right.
At initial level they could be used for image galleries, slideshows etc. and dont know to what max.extend they could be used. Plz refer below for more details.
Where can I get more details about JQuery?
No, the language is virtually the same. You need to know about Microsoft's alternative event handling mechanism, though. For instance, they use attachEvent() instead of addEventListener(); use a global event object instead of passing it to the event listener; call event listeners as global functions instead of invoking them as methods of the object for which they are registered, etc.
On jquery.com ...