This document discusses 3D printing and additive manufacturing. It begins by defining 3D printing as a process that creates 3D objects by laying down successive layers of material. Next, it explains how 3D printing works by using CAD software to virtually design an object and slice it into layers to guide the printer. The document also outlines some key benefits of 3D printing like increased innovation and faster time to market. Finally, it provides examples of industrial and domestic applications of 3D printing technology.