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What is AWS CloudFront?
**AWS CloudFront** is a Content Delivery Network (CDN) service offered by Amazon Web Services (AWS). It is designed to securely and quickly deliver data, videos, applications, APIs, and static/dynamic content to users across the globe with low latency and high transfer speeds.
How Does It Function?
CloudFront speeds up the distribution of your content by routing user requests through a global network of data centers called **Edge Locations**.
1. Origin Server: You store the original version of your files (like website code, images, or videos) on an "origin server," such as an Amazon S3 bucket, an EC2 instance, or a custom HTTP server.
2. User Request: When a user requests content from your website or application, CloudFront intercepts the request.
3. Caching & Edge Locations: CloudFront routes the request to the nearest Edge Location geographically.
* If the requested content is already cached at that edge location, CloudFront serves it immediately to the user.
* If the content is not cached, CloudFront retrieves it from the origin server, saves a copy in the cache for future requests, and delivers it to the user.
Key Benefits
- Low Latency and High Speed: By caching content closer to end users, CloudFront significantly reduces loading times and reduces server response delays (latency).
- Global Scale and Reach: It leverages AWS’s massive global infrastructure, allowing businesses to seamlessly serve users worldwide without setting up data centers in every region.
- Security & DDoS Protection:
- Integrates natively with **AWS Shield** and **AWS WAF (Web Application Firewall)** to protect against distributed denial-of-service (DDoS) attacks and web exploits.
- Supports custom SSL/TLS certificates and HTTPS encryption to ensure data in transit is secure.
* **Cost Efficiency:** Reduces the bandwidth and processing load on your primary origin servers, which lowers overall hosting and bandwidth costs.
* **Customizability with Edge Computing:** Using AWS Lambda@Edge or CloudFront Functions, you can run custom code at edge locations to personalize content, rewrite URLs, or authenticate users before requests reach your main server.
