Mechanical engineering is the oldest branch of engineering, born with humanity's first use of tools. It explores the core physical principles sustaining today's industrial and technological civilization, and designs the foundations of future technology. Grounded in an understanding of force and motion, heat and fluids, energy transfer, and materials and structures, it implements and advances the fundamental technologies of modern industry.

Building on these foundational principles, mechanical engineering addresses complex real-world problems through broad research spanning design, manufacturing, and systems implementation, translating that work into innovative technology and industrial advancement. More recently, rapid integration with artificial intelligence and data-driven modeling has expanded the field into a new research paradigm that combines deep understanding of physical laws with data-based learning. Physical AI in particular has emerged as a key enabler of intelligent systems that understand real-world physical interactions and operate with autonomous judgment, opening new possibilities for mechanical engineering research. The field is also expanding rapidly into diverse convergent areas including advanced manufacturing, bio-medicine, semiconductors, and micro/nano engineering.

In this way, mechanical engineering is developing as the central discipline leading new industries and convergence research by solving the key technological challenges of the future — sustainable energy, intelligent systems, and advanced manufacturing.