Summary
In this chapter, we reviewed a classification that is commonly used to differentiate the various services available on cloud platforms: Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS).
We also learned about a few of the most fundamental services available in AWS. These services are the foundation for the rest of the services offered in AWS. For example, a service such as Amazon SageMaker or Amazon DynamoDB under the hood relies on core services such as EC2 and S3. One way to look at this is if you look purely at the traffic and usage volume, AWS's biggest customer is AWS. However, AWS doesn't charge other AWS departments for its service usage in the same way it charges its regular customers. So, the EC2 group in AWS is not getting rich from the SageMaker team.
Hopefully, after reading this chapter you are now able to decide when it's best to use the compute and storage services covered in this chapter.
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