The article documents a hands‑on project that creates a custom Amazon Web Services (AWS) Virtual Private Cloud (VPC) and launches EC2 instances in both public and private subnets. By walking through instance creation, key‑pair generation, and network configuration, the author demonstrates how subnet choice directly influences accessibility, security, and routing. The built‑in "VPC and more" wizard automates the provisioning of essential components such as route tables, internet gateways, and NAT gateways, while providing a visual resource map that clarifies the overall architecture.

Understanding these interactions is critical for cloud engineers seeking to design scalable, secure environments that balance cost—through default tenancy—and isolation—via dedicated tenancy. The practical experience reinforces the concept that EC2, VPC, subnets, and gateways operate as an integrated system rather than isolated services, enabling more efficient deployment of workloads and better control over inbound and outbound traffic. The project also highlights the role of NAT gateways in allowing private‑subnet instances to reach the internet without exposing them to inbound connections.