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 surface of the object at various points. The data collected helps in assessing the object's dimensions and tolerances, ensuring it meets design specifications. CMMs are commonly used in manufacturing and assembly processes, particularly in industries like aerospace, automotive, and electronics. They provide precise measurements that are crucial for quality control, helping to identify defects and ensure that parts fit together correctly in larger systems.