When learning AWS networking, one of the most important concepts to understand is the difference between:

Public Subnet

Private Subnet

At first these terms may sound confusing. But once you understand how internet access works inside a VPC, the concept becomes very simple.

In this article, we will understand:

What a subnet is

What public and private subnets are

How internet access works in AWS

What a Load Balancer does

How routing works

Real-world architecture examples

What is a Subnet?

A subnet is a smaller network created inside a VPC.

When we create a VPC, AWS gives us a large IP address range called a CIDR Block .

Example: 192.168.0.0/16

Instead of using the entire IP block, we divide it into smaller sections called Subnets .…