A developer's breakdown of AWS services reveals a core insight: EC2, ECS, EKS, and Lambda aren't competitors but different abstraction levels. The key is understanding your responsibility versus AWS's management. This mental model shifts the question from "which is better?" to "how much work do I handle?"

EC2 offers full server control, requiring you to manage OS, scaling, and availability. ECS provides a managed container orchestration, letting you focus on Docker containers without Kubernetes complexity. EKS is for Kubernetes users, where AWS manages the control plane but you still handle pods and deployments.

Lambda represents the highest abstraction, removing servers entirely for event-driven code. The author concludes these services solve distinct problems, not replace each other. For newcomers, finding the right mental model is more valuable than memorizing features, clarifying the path from virtual servers to serverless functions.