A 3D scanner is a device that captures the shape and appearance of a physical object and converts it into a digital 3D model. It uses various technologies, such as laser scanning or structured light, to measure the object's dimensions and surface details. This digital representation can be used in various fields, including engineering, architecture, and art. 3D scanners are valuable tools for creating accurate models for prototyping, reverse engineering, and quality control. They enable users to analyze and modify designs more efficiently, making them essential in industries like manufacturing and healthcare. The resulting 3D models can also be used for 3D printing and virtual simulations.