Conceptual Structure of Amazon S3

To get started, read the core concepts documented here:

At its heart, S3 is conceptually simple; it lets you store objects in buckets. An object is associated with a bucket via a key. There are authentication and authorization schemes associated with S3 to grant you control over access to the buckets and objects. You can associate some amount of metadata (in the form of ­key-­value pairs) with objects.

The following are a few more important points: