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 machine records the coordinates of these points, allowing for precise measurements of dimensions, shapes, and features. CMMs are commonly used in manufacturing and assembly processes to ensure that parts meet specified tolerances. They can measure complex shapes and are essential for quality control in industries such as automotive, aerospace, and electronics.