Input/Output
Computers · इनपुट/आउटपुट
📋Quick Overview
Input devices send data to the computer for processing, while output devices display or produce results. Some devices are both input and output (e.g., touchscreen, modem). The keyboard is the most common input device and the monitor is the most common output device. A scanner converts physical documents to digital, while a printer converts digital to physical.
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Keyboard: most common input device; Monitor: most common output device
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Touchscreen, modem, and headset are examples of both input and output devices
📖Input Devices
| Device | Type | Function |
|---|---|---|
| Keyboard | Input | Text/commands entry — QWERTY layout |
| Mouse | Input | Point & click — invented by Douglas Engelbart (1968) |
| Scanner | Input | Converts physical documents to digital images |
| Microphone | Input | Converts sound to electrical signals |
| Webcam | Input | Captures video for computer |
| Barcode Reader | Input | Reads barcodes using laser/LED |
| Joystick | Input | Gaming and flight simulation control |
| OCR | Input | Optical Character Recognition — reads printed/handwritten text |
| OMR | Input | Optical Mark Recognition — reads pencil marks (MCQ sheets) |
| MICR | Input | Magnetic Ink Character Recognition — reads bank cheques |
📖Output Devices
| Device | Type | Function |
|---|---|---|
| Monitor | Output | Displays visual output — LCD, LED, OLED types |
| Printer | Output | Produces hardcopy — Laser, Inkjet, Dot Matrix, 3D |
| Speaker | Output | Converts electrical signals to sound |
| Projector | Output | Projects images/video on large screen |
| Plotter | Output | Prints large drawings/maps (used in engineering) |