🎯 Learning Objectives

• Understand what AWS CloudFormation is and why it is used
• Learn the structure of a CloudFormation YAML template
• Understand the core building blocks: Parameters, Resources, and Outputs
• Deploy a real VPC stack using the AWS Console
• Inspect the resources that CloudFormation created on your behalf
• Learn how to safely delete a CloudFormation stack

Part 1: What is CloudFormation?

Explanation

AWS CloudFormation is an Infrastructure as Code (IaC) service. Instead of clicking around the AWS Console to create resources, you write a YAML (or JSON) file that describes exactly what you want — and CloudFormation builds it for you automatically.

This approach has major advantages:

• ✅ Repeatable — run the same template in any region or account
• ✅ Version-controlled — store your infrastructure in Git just like code
• ✅ Safe to delete — CloudFormation tracks everything it created, so it can tear it all down cleanly

Key Concepts

• Stack — a single deployment of a CloudFormation template. One template = one stack = a group of related AWS resources.
• Template — the YAML or JSON file describing your desired infrastructure.
• Resource — any AWS object the template creates (VPC, Subnet, EC2, S3 bucket, etc.).