➀ Nanoscale metallic multilayer composites (NMMCs) consist of alternating layers of different metals at the nanoscale, offering unique properties not found in bulk materials. ➁ These composites exhibit enhanced mechanical, thermal, electrical, and optical properties, making them suitable for advanced applications in industries like aerospace and electronics. ➂ The review discusses various synthesis and characterization techniques, emphasizing the importance of a multidisciplinary approach to fully understand and optimize these materials for future technological advancements.