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Amazon CloudFront is AWS’ content delivery network(CDN) that securely delivers data, videos, applications, and APIs to customers globally with low latency, high transfer speeds
You can read more about the Amazon CloudFront key features here: https://aws.amazon.com/cloudfront/features/?whats-new-cloudfront.sort-by=item.additionalFields.postDateTime&whats-new-cloudfront.sort-order=desc#edge-locations
To deliver your content with CloudFront you would need to create CloudFront distributions, CloudFront distribution to tell CloudFront where you want content to be delivered from, and the details about how to track and manage content delivery. Distributions are unique CloudFront.net domain name to reference objects (abc123.cloudfront.net) https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/GettingStarted.html
You can read more on how CloudFront delivers content to your users here: https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/HowCloudFrontWorks.html
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Yes, your understanding is correct. DNS routes the request to the CloudFront POP, typically the nearest CloudFront POP in terms of latency—and routes the request to that edge location.
CloudFront checks its cache for the requested object. If the object is in the cache, CloudFront returns it to the user. If the object is not in the cache, then it tries to reach the origin to fetch the content. More details are in the links shared below.
Origin details are never revealed via CloudFront. Additionally, you can restrict access to the origin i.e. you can make sure that users can access the content only through the specified CloudFront distribution and prevents users from accessing the content directly.