PaaS
Platform as a Service — the provider manages the OS and runtime so you only deploy and run your application.
Platform as a Service sits between IaaS and SaaS. The provider manages the infrastructure, operating system, runtime, and middleware, leaving the customer responsible only for application code and data. AWS Elastic Beanstalk is the canonical PaaS example on CLF-C02: you upload code and it provisions capacity, a load balancer, and auto scaling. Amazon RDS shows PaaS traits since AWS handles the engine, patching, and backups. The exam contrast is with IaaS (EC2), where you keep OS-level control and apply patches yourself.
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