If you've ever clicked "Create ECS" somewhere in the console, two questions immediately come to mind: "Why not use EKS?", "What's the difference from Fargate?" On the surface, all three look like "tools for running containers," but when you receive your billing statement, the difference can be hundreds of dollars per month. The SAP exam presents scenarios with all three services, averaging 3-4 questions per domain, but surface-level keyword matching won't get you even halfway there.
This article examines why ECS, EKS, and Fargate evolved into their current forms, how the control plane and data plane diverge, and where the branching occurs depending on scenarios