What is Amazon CloudFront? A Beginner's Guide to AWS CDN
Published on May 21, 2025
Amazon CloudFront is a Content Delivery Network (CDN) service from Amazon Web Services (AWS). It delivers your website's content (images, videos, APIs, and files) faster to users around the world by caching that content at servers physically close to them.
If you've just started exploring AWS, or you're wondering whether CloudFront is the right tool for your project, this guide covers the essentials: what it is, how it works, what it's good for, and when to use it.
Looking for the full technical deep-dive? Read our Amazon CloudFront Ultimate Guide →
What is a Content Delivery Network (CDN)?
A Content Delivery Network (CDN) is a network of servers distributed across the globe. When someone visits your website, instead of their request travelling all the way to your origin server (which might be in a single data centre in Virginia, for example), the CDN serves a cached copy of your content from a server much closer to them.
The result: faster load times, lower server load, and a better experience for every user, regardless of where in the world they are.
CDNs are particularly useful for:
- Delivering static content: images, CSS, JavaScript, fonts
- Streaming video and other media files
- Distributing software updates or large downloads
- Reducing latency for users far from your origin server
Amazon CloudFront is AWS's native CDN, and it's what most teams on AWS use to solve these problems. If you want a broader introduction to how CDNs work before diving into CloudFront, read our What is a CDN? guide first.
How Does Amazon CloudFront Work?
CloudFront operates through a global network of Edge Locations: AWS data centres positioned around the world. Here's what happens when a user requests content from your site:
1. Edge Cache check
CloudFront checks whether the content is already cached at the Edge Location nearest to the user. If it is, it serves it immediately with minimal latency.
2. Origin Fetch
If the content isn't cached yet, CloudFront retrieves it from your origin server (an S3 bucket, EC2 instance, load balancer, or any custom HTTP server), serves it to the user, and stores a copy at the edge for future requests.
3. Global Distribution
All subsequent requests for that content from nearby users are served from the edge cache, not your origin. This continues until the cache expires, based on the TTL (Time to Live) rules you configure.
The practical effect: a user in Helsinki, one in São Paulo, and one in Tokyo all get your content from a server close to them, not routed through one central data centre.
Key Features of Amazon CloudFront
Global Reach
CloudFront runs on a network of 600+ Points of Presence across 100+ cities in 50+ countries. Content reaches users everywhere with minimal delay.
Automatic Scaling
CloudFront scales automatically with your traffic: no capacity planning, no pre-provisioning. It handles steady traffic and sudden spikes equally well.
Security Features
CloudFront integrates natively with AWS Shield (DDoS protection), AWS WAF (application firewall), and AWS Certificate Manager (free SSL/TLS certificates). Your content is encrypted in transit and protected at the edge before threats ever reach your origin.
Flexible Origin Support
Your origin doesn't have to be AWS-native. CloudFront works with S3 buckets, EC2 instances, load balancers, API Gateway endpoints, and any custom HTTP/HTTPS server, including servers outside of AWS entirely. This makes it a viable Amazon CDN option even for hybrid architectures.
Cost-Effective Pricing
CloudFront uses pay-as-you-go pricing based on data transferred and requests made. There's no upfront cost and no minimum commitment. A Free Tier covers 1 TB of data transfer and 10 million requests per month for the first 12 months.
For a full breakdown of costs by region and use case, see our CloudFront Pricing Guide →
Benefits of Using Amazon CloudFront
1. Faster Load Times
Serving content from an edge server close to the user reduces the physical distance data travels, which directly reduces page load time. This matters for user experience and for SEO: Google uses Core Web Vitals metrics like TTFB and LCP as ranking signals, and CloudFront improves both.
2. Reduced Origin Server Load
Every request served from the edge cache never hits your origin. During a traffic spike (a product launch, a viral moment, a seasonal sale) CloudFront absorbs the load so your backend doesn't have to.
3. Enhanced Security
CloudFront acts as a protective layer in front of your infrastructure. DDoS attacks are absorbed at the edge. WAF rules block malicious bots and injection attempts before they reach your application. SSL/TLS encryption is handled end-to-end.
4. Scalability Without the Work
You don't run or maintain the CDN infrastructure. AWS manages the global edge network; you configure a distribution and point it at your origin. Scaling happens automatically.
5. Cost Savings
Data transfer out via CloudFront Edge Locations is typically priced lower than equivalent data transfer directly from EC2 or S3 in most regions. Combined with reduced origin load, CloudFront generally lowers total infrastructure spend for content-heavy applications.
6. Better SEO via Core Web Vitals
Page speed is a Google ranking factor. Faster TTFB (Time to First Byte) and LCP (Largest Contentful Paint), both directly improved by edge caching, contribute to better Core Web Vitals scores and improved organic search performance.
Common Amazon CloudFront Use Cases
Static Website and Asset Delivery
Pair CloudFront with an S3 bucket to serve a static website or deliver CSS, JS, and image assets globally. Origin Access Control (OAC) ensures your S3 bucket is never directly exposed to the public internet.
Video Streaming
CloudFront supports on-demand video (HLS, DASH) and live streaming, delivering consistent playback performance to viewers worldwide regardless of connection speed or device.
API Acceleration
CloudFront can cache API responses at the edge and route dynamic requests over AWS's optimised backbone, reducing API latency for applications with global users.
Software and File Distribution
Deliver installers, firmware updates, and large binaries at scale without straining your origin. CloudFront handles high volumes of concurrent downloads efficiently.
E-Commerce
Faster product images, JS bundles, and checkout flows. Geo-restriction capabilities help with regional compliance. Signed URLs protect time-limited or personalised content.
SaaS Applications
For SaaS products with customers across multiple regions, CloudFront reduces application latency and ensures consistent performance, without building multi-region infrastructure from scratch.
Is Amazon CloudFront Right for You?
CloudFront is the natural choice if you're already building on AWS. The integration with S3, EC2, Lambda, WAF, Shield, and Route 53 is native: you're not stitching together third-party tools.
If your stack is not AWS-based, or you prefer a simpler flat-rate pricing model, alternatives like Cloudflare may be worth evaluating. But for AWS workloads, especially those involving S3, API Gateway, or serverless architectures, CloudFront is typically the right starting point.
"Building a marketplace on top of AWS requires more than picking the right services. It requires an architecture that can isolate clients cleanly, deploy consistently across environments, and stay cost-efficient while the customer base is still growing."
— Eugene Orlovsky, CEO at Perfsys
See how this plays out in practice: Tibica: Serverless Cloud Marketplace on AWS
If you're not sure whether CloudFront is the right fit for your architecture, Perfsys AWS consultants can review your setup and recommend the right approach.
Quick Setup Overview
Getting started with CloudFront typically takes around 15 minutes:
- Open the CloudFront Console in your AWS account
- Click Create Distribution and set your origin (S3 bucket, EC2 instance, or custom URL)
- Set your Viewer Protocol Policy to redirect HTTP to HTTPS
- Attach an ACM SSL certificate for your custom domain
- Deploy: propagation across all Edge Locations takes 5–15 minutes
- Update your DNS CNAME to point to your *.cloudfront.net distribution domain
For detailed configuration steps, including cache behaviour settings, Origin Access Control for S3, TTL rules, and Lambda@Edge, see the full setup guide in our Ultimate Guide (linked below).
💡 Lambda@Edge lets you run lightweight functions at CloudFront edge locations, so you can customize content delivery (redirects, A/B tests, auth checks) without routing requests back to your origin. CloudFront Functions is a lighter, lower-cost option for simple request/response transformations. Both are covered in the Ultimate Guide.
FAQ
CloudFront includes a Free Tier covering 1 TB of data transfer and 10 million HTTP/HTTPS requests per month for the first 12 months. After that, billing is pay-as-you-go based on data volume and request count. You can check the official AWS CloudFront pricing page for the latest numbers by region, or see our Pricing Guide (linked below) for a full regional breakdown.
Yes. CloudFront supports any HTTP/HTTPS origin, including servers outside of AWS. You don't need to run your infrastructure on AWS to use CloudFront as your CDN.
CloudFront includes end-to-end SSL/TLS encryption, AWS Shield Standard for automatic DDoS protection, AWS WAF for application-layer filtering, geo-restriction controls, and signed URLs/cookies for private content access. You can read more in the AWS CloudFront security documentation.
Amazon S3 is an object storage service: it stores your files. CloudFront is a CDN that caches and distributes those files globally at low latency. They're commonly used together: S3 stores the assets, CloudFront delivers them to users worldwide.
CloudFront is AWS's native CDN with deep integration across the AWS ecosystem: S3, Lambda@Edge, WAF, Shield, ACM, and Route 53. Cloudflare is an independent platform that works with any infrastructure stack. For AWS-native workloads, CloudFront is generally the stronger choice.
Amazon CDN is a common way to refer to Amazon CloudFront, which is AWS's content delivery network service. CloudFront is the only CDN product offered natively by AWS.
A CloudFront distribution is the configuration unit you create when setting up CloudFront. It defines your origin server, cache behaviour rules, SSL certificate, and access controls. Each distribution gets a unique *.cloudfront.net domain that you can map to your custom domain via DNS.
Conclusion
Amazon CloudFront is AWS's content delivery network. For teams building on AWS, it's the most integrated and straightforward CDN available. It caches your content at 600+ Edge Locations worldwide, protects your origin from traffic spikes and attacks, and delivers faster load times to users everywhere on a pay-as-you-go model with no upfront commitment.
Setting up CDN correctly the first time saves you cost and headaches later. Perfsys AWS consultants help SMBs and startups get their AWS infrastructure right from the start.
Anastasiia Tokareva
Software Engineer
AWS Experts, On-Demand
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