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What is CDN (Content Delivery Networks) ?

Lets try to understand CDN by an example:

When we type in a web address like www.google.com, our browser is actually asking Google’s servers to send back all of the resources needed to display that page. That includes things like the code to position search results, to manage what happens when you run a new query and whatever the latest flavor of their logo is. All of those things have to be downloaded over wires that can run for quite a long distance. A CDN is a transparent way to physically move many of the resources of a webpage closer to our computer.

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