AWS Compute Optimizer is a service that helps you identify optimal AWS resources for your workloads to reduce costs and improve performance by analyzing resource utilization metrics. This concept is known as rightsizing - the practice of matching instance types and sizes to your workload performance and capacity requirements at the lowest possible cost.

Key points:

• Rightsizing involves analyzing your workloads and adjusting the size of your instances to match your actual needs
• AWS Compute Optimizer analyzes historical utilization metrics to recommend optimal AWS resources
• This helps eliminate over-provisioning and reduces costs while maintaining performance
• Security validation refers to security assessment tools like AWS Security Hub
• Elasticity refers to the ability to scale resources up or down based on demand
• Global reach refers to AWS's worldwide infrastructure and services availability