什么是Amazon CloudFront？

Amazon CloudFront is cache for your content.

• It caches content at the edge locations to provide your users the
  lowest latency access possible.
• Without a CDN your users will experience higher latency access to
  your content. Your servers will also be under higher load as they are
  serving the content as well as handling the web requests.
• One customer needed to serve content at 60 Gbps. The web tier didn’t even know that was going on, CloudFront handled it all.