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Amazon S3 is a simple key, value store designed to store as many objects as you want. You store these objects in one or more buckets. An object consists of the following:
Key—The name that you assign to an object. You use the object key to retrieve the object.
For more information, see Object Key and Metadata
Version ID—Within a bucket, a key and version ID uniquely identify an object.
The version ID is a string that Amazon S3 generates when you add an object to a bucket. For more information, see Object Versioning.
Value—The content that you are storing.
An object value can be any sequence of bytes. Objects can range from zero to 5 TB in size. For more information, see Uploading Objects.
Metadata—A set of name-value pairs with which you can store information regarding the object.
You can assign metadata, referred to as user-defined metadata, to your objects in Amazon S3. Amazon S3 also assigns system-metadata to these objects, which it uses for managing objects. For more information, see Object Key and Metadata.
Subresources—Amazon S3 uses the subresource mechanism to store object-specific additional information.
Because subresources are subordinates to objects, they are always associated with some other entity such as an object or a bucket. For more information, see Object Subresources.
Access Control Information—You can controls access to the objects you store in Amazon S3.
Amazon S3 supports both the resource-based access control, such as an Access Control List (ACL) and bucket policies, and user-based access control. For more information, see Access Control.