The combination of two or more different reinforcement materials to produce hybrid composites is gaining significant attention in the field of materials science. These materials have become exceedingly adaptable engineering materials with specific properties for numerous applications. The fabrication process or input parameters have a significant impact on the microstructure and mechanical characteristics of these composites. The complex relationship among the processing parameters and the microstructural and mechanical properties of hybrid composites is thoroughly explored in this chapter. The introductory section clarifies the importance of combining various reinforcements to achieve desired performance characteristics by outlining the basic ideas behind hybrid composites. It also underlines how important processing variables like tool rotation speed, tool transverse speed, tilt angle, and reinforcement concentration are in determining the microstructure characteristics of these novel hybrid materials.