Definition: AWS content delivery network (CDN) service that delivers data, videos, and applications with low latency globally.
— Source: NERVICO, Product Development Consultancy
What is Amazon CloudFront
Amazon CloudFront is AWS’s content delivery network (CDN) service that delivers data, videos, applications, and APIs to users worldwide with low latency and high transfer speeds. CloudFront has over 450 points of presence (PoP) distributed globally that cache content close to end users. It integrates natively with other AWS services such as S3, EC2, Elastic Load Balancing, and Lambda@Edge, enabling complete content distribution architectures within the AWS ecosystem.
How It Works
When a user requests content, CloudFront serves it from the nearest point of presence if cached. If not cached, CloudFront fetches the content from the configured origin (an S3 bucket, an EC2 server, or any HTTP server) and stores it in cache for future requests. Cache policies control how long stored content persists through TTL (Time to Live). CloudFront supports static and dynamic content, video streaming, WebSockets, and edge functions. Lambda@Edge and CloudFront Functions allow running custom logic at points of presence, such as URL redirection, header customization, or edge authentication.
Why It Matters
Content delivery latency directly affects user experience and search engine rankings. CloudFront reduces latency from hundreds of milliseconds to under 20ms for most global users. It also acts as a protection layer for the origin server, absorbing traffic spikes and DDoS attacks. For applications serving content to users across multiple regions, CloudFront is the difference between acceptable and unacceptable load times.
Practical Example
An educational platform with users in Europe and Latin America serves course videos through CloudFront. Without a CDN, users in Mexico experienced 3 seconds of initial buffering when playing videos stored in an S3 bucket in Ireland. With CloudFront, the first user in a region loads the video in 1.5 seconds, and subsequent users in the same region play it instantly from cache. Data transfer costs decrease by 30% thanks to CloudFront’s network efficiency.