Haptics provide mechanical feedback through the use of vibrations to simulate specific events, surfaces, and effects. It can simulate different surfaces and effects by varying frequency, amplitude, duration, and direction of a vibration.

Figure 1-1 illustrates three types of actuators, Eccentric Rotating Mass (ERM), Linear Resonant Actuator (LRA), and Piezo Actuator.

Figure 1-1 Three Types of Actuators