sources:

For each object in a bucket, it has:

  • key -> the unique key, which serves as its identifier
  • prefix -> used for pretending in an organised folder structure
    • used in partitioning objects for load balancing
    • used in searching and returning objects with a same prefix
  • version ID -> key for multiple versions of the same object
  • value -> actual content stored, supporting any data in any format
    • viewed as a sequence of bytes
  • metadata
    • system metadata -> assigned by S3 to manage the object
    • user defined metadata -> assigned by users, e.g. tags