In the context of product development and simulation, a "digital twin" refers to a virtual representation of a physical object or system. It uses real-time data and simulations to model the behavior and performance of its physical counterpart. Digital twins facilitate analysis, monitoring, and optimization throughout the product life cycle, providing insights that can enhance design, operations, and maintenance. By allowing for scenario testing and predictive analysis, digital twins contribute to risk mitigation and improved decision-making, making them essential in industries like manufacturing, transportation, and healthcare.