Digital twins are nothing but the 3D digital replica of a physical thing. They have been in existence since the days computer-aided design became mainstream during the 1990s. However, they remained standalone replicas for the next 20 years until augmented reality (AR) became prominent in the gaming and entertainment industries. As TechNewsWorld notes, AR—often referred to as mixed reality—is an immersive and "interactive experience of a real-world environment where computer-generated perceptual information enhances real-world objects." The technology expands our physical world by adding a digital layer and generating the AR.