digital twin 
refers to a digital replica of physical assets, processes and systems to create living digital simulation models that update and change as their physical counterparts change digital twin
 continuously learns and updates itself, conveys various aspects of its operating condition; from human experts, with deep and relevant knowledge; from other similar machines; from other similar fleets of machines; and from the larger systems and environment in which it may be a part of digital twin 
also integrates historical data from past usage to factor into its digital model