Additive manufacturing (AM) has revolutionized biomaterial processing, enabling rapid prototyping and manufacturing of complicated shapes. In addition, when the AM techniques are compared to conventional methods, it improves customization, increased speed, reduce material wastage, etc. Hence, this chapter discusses the essential role of biomaterials in modern medicine with a focus on metallic biomaterials. Further, the classification, properties, and versatile applications of biomaterials in numerous implants are described. The chapter also critically evaluates the suitable metallic biomaterials, with consideration of necessary factors such as mechanical properties, biocompatibility, wear resistance, and corrosion behavior. Moreover, the adverse effects of corrosion on human health are also explored. Finally, the chapter introduces the overview of additive manufacturing, detailing its historical origin from rapid prototyping technology. It outlines key processing steps that take place during AM and its comparison with traditional manufacturing methods.