Which AWS services offer a Reserved Instance pricing model?

The Reserved Instance pricing model is specifically designed to provide cost savings for services that are used on a consistent basis over a longer-term commitment. Amazon RDS (Relational Database Service) and Amazon EC2 (Elastic Compute Cloud) both support this pricing structure.

When utilizing Reserved Instances for EC2, users can reserve capacity for instances in specific Availability Zones at a discounted rate compared to On-Demand pricing. This is particularly beneficial for applications with steady state usage that require reliable capacity over time.

Similarly, Amazon RDS allows users to reserve database instances, providing significant savings for workloads that are predictable and require continuous database operations. By committing to a one- or three-year term, users can optimize costs while guaranteeing the necessary resources for their database needs.

In contrast, services like Amazon CloudFront and S3 primarily operate on a pay-as-you-go model, where users pay for what they consume rather than reserving resources in advance. Likewise, AWS Lambda and ECS are designed for serverless compute and container services, respectively, where pricing is based on the actual use rather than pre-purchased capacity. Lastly, Amazon DynamoDB and ElastiCache focus on on-demand pricing models, which do not align with the reserved capacity approach. Thus, the combination of RDS