Application.Caller

Application.Caller returns Range if VBA code is called from a Cell/Range.
e.g. If a UDF(User Defined Function) is called from a Cell/Range and one wants to get the address of the Cell/Range ,where it is called from.
Then it can be achieved using the following code and as in this case it returns Range so you can also set it to some object also.

Code:

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Function Test()
   
    Dim objCaller      As Object '/Range
   
    Set objCaller = Application.Caller
    Debug.Print objCaller.Address '/Application.Caller.address
    Test = objCaller.Address
   
End Function

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Application.Caller returns String if the caller is some control (e.g. DropDown,ListBox and CommandButton etc.) or Shape.

e.g. if the following function is called from some shape/control then it will print and return shape/control's name.

Code:

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Function ControlCaller()   
 
    Debug.Print Application.Caller
    ControlCaller= Application.Caller
   
End Function

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Application.Caller returns Error if the caller is a VBA procedure or function.
e.g if you call the above given function ControlCaller in some procedure or function then it will return an error.

Code:

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Sub CallIt()   
 
    Call  ControlCaller()
   
End Sub

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Note: Application.Caller does not work in Immediate Window