What is Lambda@Edge used for?

Lambda@Edge is specifically designed to allow developers to run their code at AWS Edge locations, which are geographically dispersed data centers that are part of Amazon CloudFront's globally distributed content delivery network (CDN). By deploying functions closer to end-users, Lambda@Edge reduces latency and improves the user experience by minimizing the distance that data must travel between the server and the client.

This capability is particularly useful for a variety of use cases, such as customizing web content based on user location, modifying HTTP headers or responses, and performing real-time analytics on requests as they pass through the CloudFront edge servers. Each of these functions can be executed immediately as requests and responses flow through the CloudFront distribution, ensuring that users receive a faster and more responsive experience.

In contrast, other options do not align with the primary function of Lambda@Edge. Running code on a dedicated central server refers to traditional server architectures which do not leverage the benefits of edge computing. Optimizing database storage solutions and enhancing machine learning capabilities are relevant areas within AWS but fall outside the specific purpose of Lambda@Edge, which is solely focused on processing requests at the edge.