The term MEMS (microelectromechanical systems) denotes the devices of a micro- and millimeter scale (linear dimensions from 20 μm to several millimeters), which are produced by microfabrication technology. The MEMS devices employ the motion of separate parts that are driven by electric stimuli, or, vice versa, produce electric signals by such a movement or deformation. Besides MEMS, the terms micromachined devices and microsystems technology are used for such devices and their processing. The MEMS devices include miniaturized structures, sensors, actuators, and microelectronics.