On the Jquery.com homepage, there is the big download button, and I understand what to do there I'm pretty sure. I click the button, copy all of the code, and save it as a .js file to point to when scripting requires it. 

I'm confused about the widgets and other offerings you can get when clicking on the UI link. Each seems to have it's own code that comes with it. My question is, do I need the download on the homepage in order for the UI widgets and ect.. to work, or are the UI widgets fully coded and complete, and I don't need the Download from the homepage. 

I'm fairly new to javascript itself, and was told I should start there from scratch or I'd reach a dead end with Jquery at some point, so I really just haven't gotten my feet wet much.

Thank you in advance for any explanation of what I need to do.