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 measurements taken can be used to determine the object's size, shape, and position in three-dimensional space. CMMs are commonly used in manufacturing and assembly processes to ensure that parts meet specified tolerances and quality standards. They can measure complex shapes and are essential in industries such as aerospace, automotive, and electronics for quality control and assurance.