Azure App Service
A managed PaaS platform for hosting web apps, REST APIs, and mobile back ends.
Azure App Service is a fully managed Platform as a Service (PaaS) for hosting web applications, RESTful APIs, and mobile back ends. Because Azure manages the underlying operating system, runtime patches, load balancing, and auto-scaling, developers focus on application code. It supports multiple runtimes including .NET, Java, Node.js, Python, and PHP, and integrates natively with GitHub and Azure DevOps for continuous deployment. A common AZ-900 confusion is treating App Service like a virtual machine. With a VM (IaaS) the customer controls the OS; with App Service that responsibility shifts to Microsoft. App Service plans define the compute tier and capacity, and one plan can host multiple apps, so scaling the plan scales every app running on it.
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