Introduction to Amazon EC2 Reserved Instances

Amazon EC2 Reserved instances allow you to reserve Amazon EC2 computing capacity for 1 or 3 years, in exchange for a significantly discounted hourly rate (up to 75%), compared to On-Demand instance pricing.

Reserved instances can significantly lower your computing costs for your workloads and provide a capacity reservation so that you can have confidence in your ability to launch the number of instances you have reserved when you need them.