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There are a lot of functions we can talk about if we pick this topic but the mains are point and click on icons, menus and command buttons on a computer.
the keyboard has to many functions, we can find a cursor control key, alphanumeric keys, function keys, dedicated keys, nummeric keypad and those has it's specifically funciton to make the keyboard a complete and the main input device
It's an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. Microphones are used in many applications such as telephones, tape recorders,koraoke systems,hearing aids,motion pictureproduction, live and recorder audio engineering.
In conputing, a mouse is a pointing device that funtions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse con sonsists of an object held under one of the user's hands, with one or more buttons.
in computing , an input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system such as a computer or other information appliance.Example of input devices include keyboards ,mouse,scanners, digital, cameras and joysticks
In computing, a keyboard is a typewrite- style device, which uses an aranggenment of buttons or key, to act as mechanical levers or electronic switcher.