Reserved Instances
A pricing model that provides a significant discount (up to 75%) compared to On-Demand pricing in exchange for a one or three year commitment. Available for EC2, RDS, ElastiCache, and other services.
Related General Terms
ARN (Amazon Resource Name)
A unique identifier for AWS resources. ARNs follow the format arn:partition:service:region:account-id:resource. Used to specify a resource unambiguously across all of AWS.
Availability Zone (AZ)
One or more discrete data centers with redundant power, networking, and connectivity in an AWS Region. AZs are physically separated and connected through low-latency links. Deploying across multiple AZs provides high availability.
Multi-AZ Deployment
A deployment strategy where resources are provisioned across multiple Availability Zones for high availability. Used with RDS, ElastiCache, and other services to provide automatic failover.
Region
A physical location around the world where AWS clusters data centers. Each Region consists of multiple Availability Zones. Examples include us-east-1 (N. Virginia) and eu-west-1 (Ireland).
Savings Plans
A flexible pricing model that offers lower prices on EC2, Lambda, and Fargate usage in exchange for a commitment to a consistent amount of usage (measured in $/hour) for a one or three year term.