A digital twin is a virtual representation of a physical object, system, or process that reflects its real-world version in real-time or near-real-time. It uses data from sensors, IoT devices, or other sources to simulate, monitor, and analyze the behavior, performance, or condition of the physical entity. Digital twins can be categorized into four primary types: Component Twins, Asset Twins, System Twins, and Process Twins. They evolve over time as they incorporate more data, analysis, and autonomous capabilities, reaching five levels of digital twins: Descriptive, Diagnostic, Predictive, Prescriptive, and Autonomous. AI plays a crucial role in enhancing the predictive and diagnostic accuracy of digital twins by analyzing historical and real-time data, simulating different operating situations, and executing corrective actions automatically. Digital twins have various use cases across industries, including manufacturing, healthcare, urban planning, and autonomous driving, offering benefits such as enhanced safety, improved training, informed design, and data-driven decision-making.