What is the difference between IaaS, PaaS, and SaaS in Azure?

These are three cloud service models with different levels of management. IaaS (Infrastructure as a Service): you manage the OS, runtime, middleware, and application; Azure manages the virtualization, hardware, networking, and storage. Example: Azure Virtual Machines. PaaS (Platform as a Service): Azure manages the infrastructure, OS, and runtime; you manage the application code and data. Example: Azure App Service, Azure SQL Database. SaaS (Software as a Service): Azure manages everything; you simply use the software. Example: Microsoft 365, Azure DevOps. As you move from IaaS to SaaS, you give up control but gain convenience and reduced operational overhead.