3D printing involves layering materials to build three-dimensional objects from digital files. It reduces time and costs compared to traditional manufacturing. 3D printers work by using software to guide a print head that deposits layers of plastic, ceramic, metal or other materials in thin layers until an object is complete. 3D printing is used across industries like medical, construction, and design for applications such as models, prototypes, and customized parts. While the technology continues to advance, 3D printing currently has limitations like slower speeds compared to traditional manufacturing.