This week we’re going to talk about S3. S3 is the service that the majority of developers are the most familiar with. Yet it is a service that can go really deep and has some crazy features that are not that known to the public. For that reason, I have split it in 2 parts.

In the first one we’re going to talk about the basics, along with terminology and some concepts like CORS and more. Let’s get started.

S3 Overview

Time for AWS S3 (Simple Storage Service)

• A service to store objects (files) in buckets (directories)
• Each bucket is created on a region level and its name needs to be globally unique

S3 Objects

Let’s talk about AWS S3 Objects (files)

• Everything after the bucket name is called a key
• It is composed by a prefix and the object name
• The UI will trick you that S3 has a concept of directories within buckets but it doesn’t
• Each object is max 5GB, otherwise multi-part upload

https://pbs.twimg.com/media/ExBlwG9U8AERp1S?format=png&name=small