Multi-touch

In computing, multi-touch refers to a touch sensing surface's (trackpad or touchscreen) ability to recognize the presence of two or more points of contact with the surface. This plural-point awareness is often used to implement advanced functionality such as pinch to zoom or activating predefined programs.

In an effort of disambiguation or marketing classification some companies further break down the various definitions of multi-touch. An example of this is 3M, defining multi-touch as a touch-screen's ability to register three or more distinct positions.

Read more about Multi-touch:  History of Multi-touch, Brands and Manufacturers, Implementations, Popular Culture