Amazon S3 Object Store
Amazon S3 is a key-based object store. The unique object key assigned by the user can later be used to retrieve the data. Each object is stored and retrieved using a unique key.
Each account contains one or more buckets to store data and to organize the Amazon S3 namespace. An object is uniquely identified within a bucket by a key (unique identifier) and a version ID.
the bucket is "mybucket" and the key is "myFiles/photo1.jpg"
Each object in S3 has a data and metadata component. The metadata describes the object using name-value pairs and include, for example, the date last modified and other standard HTTP metadata, such as Content-Type. A bucket can also specify the geographical region where Amazon S3 will store it.