EC2 and S3

 Amazon EC2 and Amazon S3 are the two foundational building blocks of AWS. 

The simplest way to understand the difference is:


EC2 is the computer, and S3 is the hard drive.




How They Work Together
In a real-world application, companies almost never choose one over the other; they combine them: 

  1. EC2 runs the application logic (e.g., a photo-sharing app's code).
  2. When a user uploads a photo, the EC2 instance processes it and sends it to S3 to be stored safely.
  3. When another user views the photo, it is loaded directly from S3, keeping the EC2 server free from doing heavy lifting.
How the Architecture Works Step-by-Step
  1. User Interaction: A user visits a website or app hosted on the Amazon EC2 instance. If they upload a profile picture, that file travels directly to the EC2 server.
  2. Security & Permissions: The EC2 server doesn't use hardcoded passwords to talk to storage. Instead, it securely assumes a temporary AWS IAM Role (Identity and Access Management) that gives it permission to write data to S3.
  3. Storage Offloading: The EC2 server takes the uploaded file and instantly transfers it to an Amazon S3 bucket.
  4. Fast Delivery: When other users need to see that picture, the application points their browsers directly to the unique URL of the file inside the Amazon S3 bucket. This keeps the EC2 server free to process code instead of wasting bandwidth serving raw files.

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