Azure Functions Triggers and Bindings

Triggers:

• A trigger causes an Azure function to run and a trigger defines how a function should be invoked. 
• A function can only have exactly one trigger. 
• Triggers can pass data to functions. 

Bindings:

• A binding to a function is a declarative way to connect functions to other resources. 
• There are two types of bindings: input bindings and output bindings
• Input bindings pass data to functions
• Output bindings write data out from a function. 
  (For example, read data from a queue is an input binding and write data to a database is an output binding.)
• A function trigger is a special type of input binding. 
• Bindings are optional. 
• A function can have one or multiple input and/or output bindings.