The term Digital Twin is being used with increasing frequency, but with little consistency, across multiple industries. Technologies enabling digital twins have evolved, while a simple taxonomy/ontology/vocabulary has not. To date, while many have built upon the term with their own opinions of its definition; there has been no concentrated multi-party effort to harmonize definitions and representations of digital twins. Digital Twin Consortium fills this void and has put forward a single, authoritative definition to bolster common understanding of not only the base definition of a digital twin, but also its multiple variants and applications. This panel provides an opportunity to query the lead authors of this definition, understand how they came to this definition and learn the questions they ask to answer “is this a digital twin?”