3D printing is a method of additive manufacturing that builds 3D objects layer by layer by adding material. It allows for tangible goods to be produced from a digital design. There are several methods of 3D printing including selective laser sintering (SLS), stereolithography, fused deposition modeling (FDM), and polyjet matrix technology that use different materials and processes. 3D printing has applications across many industries like medical, mechanical, architecture, fashion, and jewelry for prototyping, production, and customized parts.