Arguments import in invoke workflow

Can anyone explain to me what actually happens when we import arguments in the invoke workflow activity?

When we import arguments and assign the variables in the default value field, are we assigning the values in variables of the current workflow to the arguments of invoked workflow, or are we assigning the values in the arguments of an invoked workflow to the variables of the current workflow?

So far, I thought the prior one is the case, but here, in the 12th point, it was mentioned the second case is happening.