A coordinate measuring machine (CMM) is a device used to measure the physical geometrical characteristics of an object. It can be operated manually or controlled via computer, and it uses a probe to touch the object's surface at various points. The CMM records these points in a three-dimensional coordinate system, allowing for precise measurements of dimensions, shapes, and tolerances. CMMs are commonly used in manufacturing and assembly processes to ensure that parts meet specified design requirements. They can measure a variety of materials, including metals, plastics, and ceramics, making them essential tools in quality control and assurance in industries such as aerospace, automotive, and electronics.