Cloudfront

It is a content delivery service. Content is replicated across different edge location. An edge location is not a region nor a AZ, it is a location where data is cached.

• it caches static content (web distribution), dynamic, streaming (rtmp) data.

• it well integrates with s3, ec2, elb, route53.

• a origin for the CDN can be a ec2, s3 or a elb.

• objs in CDN are cached with a TTL

• manually cleared objs are charged by aws.

• it supports integration with AWS WAF

• it supports geo restrictions accesses