Microwave Hybrid Heating (MHH) represents a transformative advancement in the thermal processing of engineering materials, combining the volumetric efficiency of microwave energy with the stability of conventional conductive heating. By utilizing a susceptor—typically SiC, graphite, or MoSi2—MHH overcomes the limitations of low-loss or microwave-inactive materials, enabling efficient processing of metals, ceramics, and composites. The hybrid mechanism ensures uniform temperature distribution, reduced thermal gradients, and accelerated heating rates of up to 200 °C/min. Comparative studies reveal that MHH offers over 80% energy efficiency with enhanced diffusion bonding and fine microstructural development. Applications of MHH span from sintering and surface cladding to composite fabrication and polymer curing, where improved densification, adhesion, and surface integrity are achieved. Computational modeling and sensor-based power regulation enhance process precision, while AI-driven optimization and renewable susceptors further align MHH with sustainable manufacturing. Collectively, MHH establishes a new paradigm in smart, eco-efficient thermal processing for advanced materials, merging high performance with environmental responsibility.