First, let's understand what a trigger is.
In normal English, a trigger is an event or situation that causes something to start. This something can be some sort of processing of data or some other service that performs some action. Triggers are just a set of functions that get executed when some event gets fired.
In Azure, we have different types of triggers, such as an implicit trigger, and we can also create a manual trigger.
Azure Functions allow you to write code in response to a trigger in Azure. As we have seen in Chapter 2, First Function App - Anatomy and Structure of a Function App, the moment a photograph is uploaded into a blob container of a storage account, the Azure Function will start execution and resize the photograph and create a thumbnail...
