3D printers are devices that build three-dimensional objects from digital designs. They work by precisely layering material, such as plastic, metal, or resin. With 3D printers, it's possible to produce prototypes, custom parts, and intricate designs. The Creality Ender 3 Pro is a popular 3D printer recognized for its affordability, reliability, and ease of assembly, making it a preferred choice for entry-level users and 3D printing enthusiasts.