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Vic Mercier3,276 Points
What is a content delivery network?
That was covered but she didn't explained it.
Steven Parker220,415 Points
The kind of content delivery network that would apply here is simply a web resource that makes something you want available so you don't need to store it on your own website. For example, you can load the current jQuery direclty from http://code.jquery.com/jquery-3.2.1.min.js without downloading it to your server.