This chapter is a guide on the practical applications of digital twin technology, challenges and a glimpse of the future in different industries. It is a vital source of reference for researchers, students, and practitioners that seek to appreciate the potential of digital twins. This chapter elaborates on the finer elements of executing abstract ideas and emphasizes the need for a coherent understanding of both business operational and technical issues. In this regard, specific use cases in construction, energy, healthcare, transportation, aerospace, agriculture, and retail are being pointed out so as to stimulate variety of applications and innovative potential of digital twins. Three detailed use cases highlight the breadth of digital twin applications: Examples of these digital twins include Tesla’s Electric-vehicle Battery Digital Twin, Rolls-Royce’s Aircraft Engine Digital Twin and Mayo Hospital Healthcare Digital Twin. They show how digital twins improve battery design and maintenance practices in the aviation sector, which helps in reducing carbon emissions, and how personalized medicine and predictive modulation are employed to improve patient care.