It is the feature of Amazon CloudFront which allows you to run your code

closer to the location of Users of your application.

● It improves performance and reduces latency.

● Just like lambda, you don’t have to manage and provision the infrastructure

around the world.

● Lambda@Edge runs your code in response to the event created by the

CDN 

Lambda@Edge is a feature of Amazon CloudFront that lets you run code closer to users of your application, which improves performance and reduces latency. 

https://aws.amazon.com/lambda/edge/