Input Devices

In computing, an input device is a peripheral (piece of computer hardware equipment) used to
provide data and control signals to an information processing system such as a computer or information
appliance. Examples of input devices include keyboards, mouse, scanners, digital cameras and joysticks.

Many input devices can be classified according to: modality of input (e.g. mechanical motion,
audio, visual, etc.)
whether the input is discrete (e.g. key presses) or continuous (e.g. a mouse's position, though
digitized into a discrete quantity, is fast enough to be considered continuous)
the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional
navigators designed for CAD applications) Pointing devices, which are input devices used to specify a
position in space, can further be classified according to: Whether the input is direct or indirect. With direct
input, the input space coincides with the display space, i.e. pointing is done in the space where visual
feedback or the pointer appears. Touchscreens and light pens involve direct input. Examples involving
indirect input include the mouse and trackball.

Whether the positional information is absolute (e.g. on a touch screen) or relative (e.g. with a mouse that
can be lifted and repositioned) Direct input is almost necessarily absolute, but indirect input may be either
absolute or relative.[clarification needed] For example, digitizing graphics tablets that do not have an
embedded screen involve indirect input and sense absolute positions and are often run in an absolute
input mode, but they may also be set up to simulate a relative input mode like that of a touchpad, where
the stylus or puck can be lifted and repositioned.

Computer networks differ in the transmission media used to carry their signals, the communications
protocols to organize network traffic, the network's size, topology and organizational intent. In most
cases, communications protocols are layered on (i.e. work using) other more specific or more
general communications protocols, except for the physical layer that directly deals with the
transmission media.

Some Input Devices :

Keyboard || Mouse || Camera || Gamepad || Microphone || Barcode Reader

5 - May - 2025

Day : Monday