Amazon S3 enables you to upload, download, and store data across the Internet. You can also use the
data with other AWS(Amazon WebService) services, such as EC2, Amazon Elastic MapReduce, and Amazon Import/Export.
With Amazon S3, you can charge people who download data you make available. You can store up to
5 GB of data in one object but you can store as many objects as you like on Amazon S3. The path to
the data is a URL, which makes accessing the data easy.
The following list describes the features of Amazon S3:
- Create Buckets—Create and name a bucket that stores data
Buckets are the fundamental container in Amazon S3 for data storage.
- Store Data in the Bucket—Store an infinite amount of data in a bucket
Upload as many objects as you like into an Amazon S3 bucket. Each object can contain up to 5 GB
of data.
- Download Data—Download your data or enable others to
Download your data any time you like or allow others to do the same.
- Permissions—Grant or deny access to others who want to upload or download data into your Amazon S3 bucket
Grant upload and download permissions to three types of users.
Key concept of Amazon S3:
Objects
Objects are the fundamental entities stored in Amazon S3. Objects consist of object data and metadata
and can range in size from 1 byte to 5 gigabytes. The data portion is opaque to Amazon S3. The
metadata is a set of name-value pairs that describe the object. The developer can specify custom
metadata and standard HTTP metadata, such as Content-Type.
Buckets
You upload objects in buckets. There is no limit to the number of objects that you can store in a bucket.
The bucket provides a unique namespace for the management of objects contained in the bucket.
Because the namespace for bucket names is global, each developer can own up to 100 buckets at a
time.
You own each bucket you create. Amazon charge you for storing objects in your buckets and for
transferring objects in and out of your buckets.
Keys
A key is the unique identifier for an object within a bucket. In simple terms, the key is the bucket’s
name. Every object has exactly one key. Together, a bucket name and a key uniquely identify an
object in Amazon S3.You can access every object in Amazon S3 by a combination of the service
endpoint, bucket name, and key. For example, in http://doc.s3.amazonaws.com/2006-03-01/
AmazonS3.wsdl, “doc” is the bucket name and “2006-03-01/AmazonS3.wsdl” is the key.