Introduction of computer input/ output device

Computer Input and Output Devices

Computers use input and output devices to interact with users and the environment.

🔹 Input Devices

These devices send data to the computer.

Device Function

Keyboard Enters text and commands

Mouse Controls cursor, selects items

Scanner Converts physical documents to digital form

Microphone Captures sound/audio

Webcam Captures video/images

Joystick/Gamepad Used for gaming

Touchscreen Allows input through touch

Barcode Reader Scans barcodes into the system

Biometric Scanner Inputs fingerprint or retina data

🔹 Output Devices

These devices receive data from the computer.

Device Function

Monitor (Display) Shows visual output like text, images, video

Printer Produces hard copies of digital documents

Speakers Output sound and music

Headphones Provide private audio output

Projector Displays video on a large screen

Plotter Prints high-quality graphics

🔹 Input/Output (I/O) Devices

Some devices do both input and output.

Device Function

Touchscreen Input (touch) + Output (display)

Modem Sends and receives data over the internet

Network Card Transfers data to/from network

External Drive Reads from and writes to storage

Let me know if you'd like a diagram or simplified notes for study.

Here's more detailed information on input, output, and I/O devices — including examples, functions, and types.

🔷 1. Input Devices (Detailed)

Input devices help users send instructions and data to the computer.

➤ Types of Input Devices

Device Description

Keyboard Alphanumeric input device, includes function keys, navigation keys, etc.

Mouse Pointing device; moves a cursor on the screen. Types: optical, wireless, etc.

Scanner Converts hard copy documents or images into digital format

Microphone Captures audio for voice recording, video calls, etc.

Webcam Records video input (used in video conferencing, surveillance, etc.)

Joystick Controls motion in games and simulators

Graphics Tablet Allows drawing or handwriting input for design work

Trackball Like an upside-down mouse; the ball is rotated manually

Barcode Reader Scans product codes (used in stores, libraries, etc.)

Biometric Devices Scan fingerprints, retina, facial recognition for authentication

🔷 2. Output Devices (Detailed)

Output devices show or deliver the result of processed data.

➤ Types of Output Devices

Device Description

Monitor (Visual Display Unit) Displays graphical/text output; types include LCD, LED, OLED

Printer Converts soft copy (digital) documents to hard copy (paper)

Speakers Output audio — music, alerts, system sounds

Headphones Personal audio output; useful for privacy

Projector Projects screen content onto a larger surface (wall or screen)

Plotter Prints vector graphics; used in architecture, CAD, etc.

Braille Display Helps visually impaired users read text via tactile feedback

🔷 3. Input/Output (I/O) Devices (Detailed)

These devices serve as both input and output.

➤ Examples of I/O Devices

Device Input Function Output Function

Touchscreen Detects finger/stylus touch Displays content (apps, images, text)

Modem Receives data from internet (input) Sends data to the internet (output)

Fax Machine Scans document (input) Prints received fax (output)

External Hard Drive Accepts files for storage (input) Sends files to system when needed (output)

CD/DVD Drive Reads and writes data to CDs/DVDs Plays media and saves data

Smartphones Capture data (camera, mic, touch) Display content, play audio/video

📘 Quick Summary

Category Key Purpose Examples

Input Devices Send data to computer Keyboard, Mouse, Microphone, Scanner

Output Devices Receive data from computer Monitor, Printer, Speakers, Projector

I/O Devices Both send and receive data Touchscreen, Modem, External Drives, Smartphones

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