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Azure functions is the idea of events and code, developers will provide the Azure with a function or code and you till what event should trigger that function.
Azure Cloud Services: Developer can also use web roles or Worker roles. Web roles are used for hosting websites and web APIs, and Worker roles are designed for your background tasks, like processing queues and other batch work. So in cloud services all the environment related work is taken care by Microsoft and this model looks perfect for developers Why do we need Azure Functions?
Server less doesn’t means there are no server involved, of course servers are involved but it’s abstract from the users/developers. But we delegate all the management of the server to Azure instead of us doing it. So we can purely focus on business requirement. All the big enterprise application relies on the third party platform or backend. For example, for database we might use Azure DocumentDb and for authentication we might use some other third party platform. And with growing number of third party platform service, we might need to write our own custom backend code as per our requirement and that’s were Azure Functions comes to help us. So you can just tell the Azure function which events you need to respond to and you can write your own custom code. So with this comes a new term “Function as a Service (FaaS)”.
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