Amazon S3 provides a simple web services interface that can be used to store and retrieve any amount of data, at any time, from anywhere on the web. It gives any developer access to the same highly scalable, reliable, fast, inexpensive data storage infrastructure that Amazon uses to run its own global network of web sites. The service aims to maximize benefits of scale and to pass those benefits on to developers.
          亚马逊 S3 提供一种能够用于在任何时间，从web的任何位置存储和获取任何数量的数据的简单的web服务接口
Amazon S3 Functionality（功能）
Amazon S3 is intentionally built with a minimal feature set.
Write, read, and delete objects containing from 1 byte to 5 gigabytes of data each. The number of objects you can store is unlimited.
Each object is stored and retrieved via a unique, developer-assigned key.
Authentication mechanisms are provided to ensure that data is kept secure from unauthorized access. Objects can be made private or public, and rights can be granted to specific users.
Uses standards-based REST and SOAP interfaces designed to work with any Internet-development toolkit.
Built to be flexible so that protocol or functional layers can easily be added.    Default download protocol is HTTP.    A BitTorrent(TM) protocol interface is provided to lower costs for high-scale distribution.    Additional interfaces will be added in the future.
Pricing（定价）
Pay only for what you use. There is no minimum fee. Estimate your monthly bill using AWS Simple Monthly Calculator.
Storage
$0.15 per GB-Month of storage used
Data Transfer
$0.10 per GB - all data transfer in
$0.18 per GB - first 10 TB / month data transfer out
$0.16 per GB - next 40 TB / month data transfer out
$0.13 per GB - data transfer out / month over 50 TB
Data transfer "in" and "out" refers to transfer into and out of Amazon S3.
Data transferred between Amazon S3 and Amazon EC2 is free of charge
Requests
$0.01 per 1,000 PUT or LIST requests
$0.01 per 10,000 GET and all other requests*
* No charge for delete requests
Storage and bandwidth size includes all file overhead.
(Amazon S3 is sold by Amazon Web Services LLC.)
Resources（资源）
Resource Center

Technical documentation
Code samples
Articles, and other resources for building on Amazon S3

Success Stories   
Solutions Catalog
WSDL
Developer Forums
FAQs

Amazon S3 Design Requirements
Amazon S3 is based on the idea that quality Internet-based storage should be taken for granted. It helps free developers from worrying about where they are going to store data, whether it will be safe and secure, the costs associated with server maintenance, or whether they have enough storage available. The functionality is simple and robust: Store any amount of data inexpensively and securely, while ensuring that the data will always be available when you need it. Amazon S3 enables developers to focus on innovating with data, rather than figuring out how to store it.