Why are requests for static content being sent to another site?

softwareengineering.stackexchange https://softwareengineering.stackexchange.com/questions/37691

  •  30-10-2019
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Question

Whenever I login to stackoverflow or some sites I see lots of requests for sites like http://cdn.sstatic.net/. Why is this done rather than serving directly from the actual site? How does it help to speed up a website?

No correct solution

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