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Additive Manufacturing popularly known as 3D Printing is one of the digital manufacturing processes and a key enabler of Industry 4.0. It is a process of layer-by-layer deposition of material and realizing a 3D object. It can be termed several other names also, based on its application to the manufacturing community. Why additive manufacturing is referred to by different terminology has been discussed in this module. What are the unique capabilities possessed by additive manufacturing and how are they useful in real-life applications have been discussed in this module. Freedom of design, mass customization, waste minimization, and the ability to manufacture complex structures, as well as fast prototyping, are the main benefits of additive manufacturing. In particular, there are some revolutionary applications of AM in biomedical, aerospace, buildings, and protective structures that are discussed in this section. Moreover, based on what criteria the ASTM F42 committee had classified, the AM process is also covered in this module.