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TouchPad (touchpad or TrackPad) is a widely used input device in notebook computers. Which controls the action of the pointer by sensing the movement of the user's finger.
The touchpad can be regarded as a substitute for the mouse. Touchpads can also be found on other portable devices, such as personal digital assistants and some portable audio-visual devices. Due to design constraints, the touchpad is usually not larger than 20 square centimeters. Among them, Apple's MacBook Pro is equipped with the best multi-touch pad, which can be used for gesture operations such as zooming in and out of the display screen and handwriting input. It takes advantage of Apple's multi-touch technology. This technology was first developed and patented by FingerWorks (a small company in San Francisco and later acquired by Apple) and was first applied to iPhone.
Reference link: Baidu Encyclopedia-Touchpad