<p>This comprehensive review article explores the solid-state joining processes for developing structures of dissimilar materials such as titanium and aluminum alloys. These approaches are specifically invented to overcome numerous drawbacks associated with fusion-based manufacturing, particularly issues related to solidification and low mechanical properties. In a comparative background, solid-state processes offer advantages such as microstructural refinement, higher mechanical properties, reduced thermal stresses, improved microstructural control, broader material compatibility, and potentially smoother surface finishes. This work provides an in-depth analysis of the current state of knowledge and innovative advancements made for developing lightweight hybrid structures. Various methods, such as diffusion bonding, explosive welding, accumulative roll bonding, ultrasonic welding, rotational friction welding, and modern processes like friction stir welding, etc., are explored and reviewed in depth. The investigation extends to the impact of processing parameters, elucidation of the principles of different processes, analysis of the effects of process variables on structure–property relationships, underscored the significance of intermetallic phase evolution, and an exploration into resulting mechanical properties. Furthermore, the review addresses the challenges and opportunities associated with these techniques, highlighting their potential for broader implementation in manufacturing complex and lightweight components. These processes and techniques, recognized as profitable, find application in fabricating intricate parts, especially within the aviation, automotive, medical, and marine industries.</p>