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: Microsoft manages the underlying infrastructure, operating system, and runtime, while the customer deploys and configures applications and data. Azure App Service, Azure SQL Database, and Azure Functions are canonical PaaS examples. The key exam distinction is the responsibility boundary. With IaaS, such as Azure Virtual Machines, the customer patches and maintains the OS; with PaaS that shifts entirely to Microsoft, cutting operational overhead but reducing control. If a question lists OS patching as a customer task, that is IaaS, not PaaS.
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