A digital twin can be described as a digital model of a real object. But what makes it different from a prototype? How are digital twins being used in business settings outside manufacturing? How do they relate to machine learning and augmented reality? When digital twins meet their fullest potential, they enable businesses to optimize operations by managing their assets more efficiently, generating higher productivity, and reducing costs. This technical note discusses some potential benefits and drawbacks of digital twins; offers examples in aviation, car manufacturing, and agriculture; and helps managers identify where implementing the technology may be useful.