The “digital twin” is an idea to emerges as a crucial keystone of industrial growth in an era where digital innovation and it is restructuring the landscape of all the industries. This chapter discuss the depth origins and theoretical underpinnings of the revolutionary technology. The chapter gives the knowledge and the significance of the digital twin by appearing at its historical history and the synthesis of many theoretical foundations. The principle of the digital twin is explained at the beginning of the chapter, along with how critical it is for connecting the gap between virtuality and reality. The digital twin technology shows how it has induced fields as various as manufacturing, aircraft, and the Internet of Things (IoT). The historical view gives clear understanding and the complexity of the digital twin. The abstract search shows the fundamental thoughts for supporting digital twin technology. The chapter gives the demonstration of digital representation and shows how gently physical objects are reproduced online. The virtualization skill makes real and the virtual replicas of the objects through various techniques. The subject research gives the development of data interchange and real-time connection between physical and virtual systems, which is necessary to the functionality of the digital twin. The chapter gives the reader an insightful information of the core technology of digital twin. They are opening of a wide range of opportunities in the digital sphere for doing research in various field.