AWS EC2 instance Purchase Option:
On-Demand,
Reserved
Spot
Dedicated Instances.
On-Demand:
With On-Demand instances, you pay for computing capacity by the hour, with no upfront payment or long-term commitment. This is ideal for applications with unpredictable or short-term workloads.
Spot Instances:
With Spot Instances, you bid on unused EC2 capacity and pay the Spot price, which can be significantly lower than On-Demand pricing. This option is ideal for flexible applications that can be interrupted.
Reserved Instances:
With Reserved Instances, you make a low, one-time payment to reserve instances, and in return, receive a significant discount on the hourly usage charge. This option is ideal for applications with steady-state or predictable us agepatterns.
DedicatedHosts:
With Dedicated Hosts, you have the ability to use physical servers that are dedicated to your use. This option is ideal for applications that have specific compliance or regulatory requirements, or for applications that require full control over the placement of instances on specific hardware.
When deciding on an EC2 instance purchase option, consider the cost, reliability, and performance requirements of your application. AWS provides various tools and resources to help you compare costs and determine the best option for your needs