Azure App Service brings together everything you need to create websites, mobile backends, and web APIs for any platform or device. Free and Shared (preview) plans provide different options to test your apps within your budget. Basic, Standard and Premium plans are for production workloads and run on dedicated Virtual Machine instances. Each instance can support multiple application and domains. The Isolated plan hosts your apps in a private, dedicated Azure environment and is ideal for apps that require secure connections with your on-premises network, or additional performance and scale. App Service plans are billed on a per second basis.