The difference is in Amazon S3 storage types; Standard, Reduced Reservations and Glacier? What is a cloud front?

Thinking about running an image upload service on my site with PHP where users can upload their photos. Discovered Amazon S3 http://aws.amazon.com/s3/pricing/ and I think it is a good image storage solution. But I am confused about different storage types

Standard storage
Reduced redundancy
storage Glacier storage

We tried to read it on the site, but did not become wiser. How often do I want to access the data? Glacier seems to be for backups if you don't want to access data very often and redundancy reduction is the same as standard, but no secure connection? Can someone briefly explain the difference between the two and what works best for me (website / service where users can upload photos).

Also read that people recommend using CloudFront with Amazon S3 http://aws.amazon.com/cloudfront/ . What is this for? Can anyone explain why? Same here, tried to read on Amazon, but

provides developers and enterprises with an easy way to distribute content to end users with low latency, high data rates and minimal commitment to use.

even if it sounds good, does he say what it is.

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http://aws.amazon.com/about-aws/whats-new/2010/05/19/announcing-amazon-s3-reduced-redundancy-storage/

Redundant Reservation (RRS) is a new storage option in Amazon S3 that enables customers to reduce their costs by storing non-critical, reproducible data at lower reservation levels than Standard Amazon S3s storage. It provides a cost-effective, affordable solution for distributing or sharing content that is permanently stored elsewhere

Glacier: http://aws.amazon.com/glacier/

Amazon Glacier is a reliable, durable and extremely cheap storage service for data archiving and online backup



Cloudfront is a CDN: http://aws.amazon.com/cloudfront/

Amazon CloudFront is a web-based content delivery service. It integrates with other Amazon Web Services products to provide developers and businesses with an easy way to distribute content to end users with low latency, high data rates, and minimal commitment to use.

Think of it as a geographically distributed web cache where it stores copies of your images from s3, so they can be served to clients based on the closest location to the closest Cloudfront distribution.

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