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Double-click on any word to get a definition!
"Libraries" are files of code already written. You put the files in your javascript directory on your site, and link to them in your pages. Then you put some small code in your web page to use the library functions.
These JavaScript libraries can be used for large complex applications such as getting and displaying stuff from the server. But more practically, they can be very useful for simple things such as extending what CSS can do, making your design work on all browsers, etc.
To use any of these, you need to have a strong knowledge of HTML and CSS -- because that's what the JavaScript code is playing with!
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