What are digital twins and why do they matter?

Digital twins are live virtual copies of people, machines, factories, and cities, fed by real-time data. I predict they become essential across healthcare, manufacturing, cities, and infrastructure, letting organizations simulate outcomes, boost efficiency, and cut risk. Siemens runs digital twins of entire plants, Nvidia builds them for warehouses and cities, and Singapore has a twin of the whole island. You test the change on the twin before you touch the real thing. It turns expensive, dangerous experiments into cheap, safe simulations. Mistakes get made in software, not in reality. By 2030 no serious factory, hospital, or city runs without one.