Function

Within the technical context of a product/system, this term refers to a task to be performed, an activity/action to be executed or a result to be delivered (within a system) by an object (e.g. device, software) or the mode of action of the object (relationship between input and output).

Reference Volume (and volume-specific, additional or differing definitions to the standard):
VDA volume 2, 6th revised edition, April 2020