EC2 Purchasing Options

Match workloads to On-Demand, Reserved, Savings Plans, and Spot to minimize cost.

On-Demand: unpredictable, short-term workloads.
Reserved / Savings Plans: steady-state workloads (up to ~72% savings, 1 or 3 year commit).
Spot: fault-tolerant, interruptible workloads (up to ~90% savings).

Exam trap: batch/stateless jobs that can be interrupted point to Spot; always-on baselines point to Savings Plans.