3D printing, also known as additive manufacturing, is a process of creating three-dimensional objects by layering materials based on a digital model. It works by adding successive layers of material, such as plastic, metal, or resin, to construct an object, as opposed to traditional subtractive methods that involve cutting or drilling from a solid block of material. 3D printing finds applications in various industries, including manufacturing, healthcare, automotive, aerospace, fashion, and more, enabling rapid prototyping, customized production, and innovative design possibilities.