Multi-physics is an interdisciplinary research field and methodological approach focused on the study of systems involving the coupled interaction of multiple distinct physical phenomena. It investigates the emergent behavior and system-level response arising from these interactions, requiring integrated analytical and computational techniques that account for the mutual influence between different physical domains (e.g., thermal, mechanical, fluid dynamics, electromagnetics, nuclear). Its significance lies in enabling the comprehensive understanding, design, and predictive modeling of complex natural and engineered systems where phenomena are intrinsically linked.