This lecture covers the motivations behind using additive manufacturing in aerospace applications, including design processes, economic factors, material applications, historical information, and market trends. It explores the timeline of additive manufacturing processes and their impact on the aerospace industry, as well as the challenges and applications of metallic, ceramic, and polymeric materials. The lecture also delves into the processes involved in additive manufacturing, such as Electron Beam Melting, Selective Laser Melting, and Ceramic based AM, highlighting the main fields and challenges in each process.