Both Elastic Beanstalk and RDS are services that are managed at the platform level meaning
you don't need to manage the infrastructure level yourself. Therefore, tasks like OS
management and patching are performed for you
IaaS is a model where the underlying hardware platform and hypervisor are managed for you
and you are delivered tools and interfaces for working with operating system instances
SaaS is a model where the whole stack is managed for you right up to the application and you
are delivered working software that you can customize and populate with data
Hybrid is a type of cloud delivery model in which you consume both public and private cloud
and connect the two together