Stereolithography, also known as Vat Polymerization, is a 3D printing process where a photopolymer resin in a vat is selectively cured by a light source. The two most common forms of Vat Polymerization are SLA (Stereolithography) and DLP (Digital Light Processing). The main difference between these technologies is the light source they use to cure the resin: SLA printers use a point laser, while DLP printers use a voxel approach.