What is the difference between ByVal and ByRef in Visual Basic?

ByVal and ByRef are two different ways of passing arguments to a function or sub procedure in Visual Basic.

When a parameter is passed ByVal, a copy of the original value is passed to the function or sub procedure. Any changes made to the parameter within the function or sub procedure will not affect the original value.

On the other hand, when a parameter is passed ByRef, a reference to the original value is passed. Any changes made to the parameter within the function or sub procedure will affect the original value.

It is important to choose between ByVal and ByRef based on whether you want the original value to be modified by the function or sub procedure.