All web applications have some kind of configurations necessary. The method of storing and accessing these settings varies on different web application platforms. In ASP.NET they are normally stored within <appSettings> element of the web.config file. The Microsoft Azure Web Apps Service allows for these application settings to be configured within the Azure Web App configurations in the cloud, and then subsequently accessed from application code as needed. With .NET applications the application settings are accessed exactly as AppSettings contained within the web.config file. In other web platforms (Java, Node.js, PHP and Python) the application settings are access via Environment Variables.
Application Settings are stored as a Key / Value pair. These are both stored as String values. Read More