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In IT terminology, the term "skinput" refers to a new input technology that essentially uses the human body as an input device.
Skinput is also known as bioacoustic sensing or bioacoustic transmission.
New kinds of skinput interfaces involve technology that is able to locate and sense finger taps on the skin. In some cases, engineers use tools like projectors to present visual interfaces on the body. Users can then test these visual areas to produce results. Microsoft and other companies are pursuing research on these kinds of interfaces.
In general, skinput technologies allow for the use of the body's natural properties to develop new kinds of interfaces. This is directly related to the development of wearable technology and other kinds of interfaces that are body-interactive or that use the physical human body as a component of a greater setup.
In a sense, skinput is a very modern take on the classical idea of input. From the very beginning of computer systems, from Charles Babbage’s analytical engine and the first ENIAC mainframe in the middle of the 20th century, input/output was an essential component of how computing systems operated. With skinput, interfaces are moving from traditional designs like plastic key pads or computer keyboards, directly to the human body. Skinput may also have applications to other kinds of technologies like biometrics for personal identification.