S3

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General

Key
The name you assign your object
Prefix
A place to emulate a filesystem but in reality forms part of a key. S3 does not know about folders.
Version ID
Within a versioned bucket, the key and version ID combination uniquely identifies an object.
Value
The content you are storing
Metadata
A set of name-value pairs with which you can store information regarding this object. This is further broken down in User and System-defined user data. System user data will include things like: Creation date, storage class and server side encryption.
Access Control Information
S3 supports both the resource-based access control such as an ACL and bucket policies and user-based access control.

Bucket Name + Key = Object

Limits

  1. There is a soft limit of 100 buckets per account.
  2. S3 buckets are infinitely scalable when it comes to request and storage.
  3. A object can be up to 5TB in size with part sizes up to 5GB.
  4. An object can have up to 10,000 parts.

Storage Classes

  1. Standard: General purpose
  2. Standard_IA: Infrequent access
  3. Glacier: Cold storage
  4. Reduced_Redundancy: Not as robust but not as expensive