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CDN (Content Delivery Network) - AWS CloudFront

Firstly start with CDN -
CDN stands for content delivery network. It is used to deliver different type of data to end users like images,videos,applications and APIs. When you see a dynamic images using adobe flash on website. That's the use of CDN. It just stores the cached copy of contents and delivers it to end users for better speed.

How it works?
A CDN uses a network of servers in geographically dispersed locations(edge locations) to cache copies of content close to end user, lowering latency when thay download or stream the objects.
When a specific page, file, or program is required by a user ,the server dynamically selected to deliver the content is based on closest network proximity or the one with the fewest network hops to the end user.
Content is replicated across edge locations thereby providing redundancy.

 CDN Benefits
Improves customer experiance with faster page loads - bounce rates go down and customers stay on your site longer .
SEO benefits: site speed and load times are important to search engine ranking.
 A study by Google showed that every 1/2 sec of page load time dropped customer traffic by 20%. Google factors in page load times in their quality score.



You can use CDN for dynamic content like News, Weather, Sports, Social media, Advertising, Travel.

It reduces latency. Many cloud service provider companies provides this service like Akamai , AWS CloudFront .

Usage of CDN - Live and On-Demand Video Streaming, Dynamic and Customized Content

 Amazon CloudFront is a global content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to your viewers with low latency and high transfer speeds. CloudFront is integrated with AWS – both physical locations that are directly connected to the AWS global infrastructure, as well as software that works seamlessly with services including AWS Shield for DDoS mitigation, Amazon S3, Elastic Load Balancing or Amazon EC2 as origins for your applications, and AWS Lambda to run custom code close to your viewers. You can get started with CloudFront in minutes, using the same AWS tools you are already familiar with – APIs, AWS Management Console, AWS CloudFormation, CLIs, and SDKs. CloudFront offers a simple, pay-as-you-go pricing model with no upfront fees or required long-term contracts, and support for CloudFront is included in your existing AWS Support subscription.

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