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How do they work?
A library is just pre-written code that contains the logic to do certain tasks. Librarys can be very helpful when you need to perform common tasks that are tedious to code yourself. Instead of spending hours writting code from scratch you can simply import a library into your code and use it's logic.
How can jQuery help you
But in jQuery it's even easier and if you're going to be hiding and displaying elements a lot it can save a lot of time. Consider the follow:
jQuery makes use of CSS notation so you can get elements by specifying their ID or class with a '#' or a '.' as you would in CSS.
So what if you that div to fade out slowly instead of just disappear? That's simple in jQuery! You just call the fadeOut() function instead.
That's it! You can even specify a fade out duration in milliseconds as a parameter...
Is there any other benefits?
jQuery is a brilliant tool if you're interested in creating dynamic websites. It's very easy to implement AJAX and other modern web development concepts.
You can also be confident that code will support all the important browsers and be bug free.