3. Input and Output Devices
A computer cannot work on its own.
It requires input devices to receive data and instructions, and
output devices to display the results in a human-readable form.
These devices act as a bridge between the user and the computer system.
Input Devices
An input device is a hardware component used to enter data, instructions, or commands into a computer.
| Input Device | Function |
|---|---|
| Keyboard | Used to type text, numbers, and commands |
| Mouse | Used to point, click, drag, and select items |
| Scanner | Converts physical documents into digital form |
| Microphone | Used to input sound and voice |
| Webcam | Used to capture images and videos |
Special Input Devices
- Joystick: Used in games and simulations
- Light Pen: Used to draw directly on the screen
- Touch Screen: Accepts input through touch
- Barcode Reader: Reads barcode data
Output Devices
An output device is a hardware component that displays or produces the results of processed data.
| Output Device | Function |
|---|---|
| Monitor | Displays text, images, and videos |
| Printer | Produces output on paper |
| Speaker | Outputs sound and audio |
| Projector | Displays output on a large screen |
| Headphones | Provides personal audio output |
Types of Printers
- Impact Printers: Dot Matrix Printer
- Non-Impact Printers: Inkjet, Laser Printer
Difference Between Input and Output Devices
| Input Devices | Output Devices |
|---|---|
| Used to enter data | Used to display results |
| Convert user data to machine-readable form | Convert machine data to human-readable form |
| Keyboard, Mouse, Scanner | Monitor, Printer, Speaker |
Some devices like touch screens work as both
input and output devices.
Input and output devices play a vital role in the functioning of a computer system. They enable communication between the user and the machine. Understanding these devices is essential for learning computer fundamentals, AI systems, and modern digital technology.