Amazon CloudFront (CDN) is a fast content delivery network that delivers data, videos, and APIs to customers worldwide with low latency and high transfer speeds. It's also a developer-friendly service. CloudFront integrates with AWS. CloudFront can be used in both physical locations that are directly connected with the AWS global infrastructure as well as other AWS services. CloudFront integrates seamlessly with AWS Shield, Amazon S3, Elastic Load Balancing, or Amazon EC2 as origins of your applications. Lambda@Edge allows you to run custom code closer and customize the user experience. Lastly, if your AWS origins include Amazon S3, Amazon EC2 and Elastic Load Balancing you don't have to pay for data transferred between CloudFront and these services.