Amazon S3 is a fully managed, object-based storage service that is highly available, highly durable, very cost-effective, and widely accessible.

It offers unlimited storage available, with a file size between 0 bytes and 5 Terabytes

It provides strong read after write consistency and uses standards-based REST web interfaces to work with objects.

S3 is a regional service so you need to specify to which region you want to upload your data to (even though S3 in the UI config does not let you select a Region and is shown as global). Nevertheless, Buckets must have a unique name - all over the world, across all AWS accounts.

To reduce latency it is best practice to create Buckets in the a region that is physically closest to your users.

On object consists of:

key ( name of the object/file)

versionId

value ( the data/file)

metadata

subresources

In the UI console they will look like real folder but they are not. there is no hierarchy folders, make the key look like file system but are in fact just part of the key.