Amazon EC2 Spot Instances let you take advantage of unused EC2 capacity in the AWS cloud. Spot Instances are available at up to a 90% discount compared to On-Demand prices. You can use Spot Instances for various stateless, fault-tolerant, or flexible applications, and other test and development workloads. You can add, scale, and manage Spot Instances in your AWS Elastic Beanstalk environments through the Elastic Beanstalk console, EB CLI, and Elastic Beanstalk API.