Computer Hardware Devices
Computer hardware refers to the physical components of a computer that can be seen and touched by the user. By the use of these hardware devices, it made very easy for the computer for processing its data, store and retrieve. Hardware is one of the basic and necessary parts of a computer system.
An input device can be defined as an electro mechanical device that allows the user to feed data into the computer for analysis and storage and to give commands to the computer. The data is entered into the main memory through the input devices. They Accept instructions from the user and convert the accepted instructions into the machine language.
Some of the commonly used input devices are keyboard, mouse, joystick, trackball, light pen, touch screen, OMR, OCR, MICR, barcode reader, smart card reader, biometric sensor, Mic, Scanner, Web Cam, PC card etc.
An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing to the outside world. some of commonly used output devices are Screen, Monitor, LCD, LED, Printers, Plotter, Speaker, Headphones, Projector Etc.
Both Input and Output Devices
Few devices that give input and also show or get the output through same device.
Some commonly used both input and output devices are Modems, Network cards, Touch Screen, Headsets, Facsimile, Sound cards/Audio cards