What Are Input and Output Devices

Short answer

Input devices send data to the computer, while output devices receive data from it. Together, they enable human-computer interaction.

How it works

• Input: Keyboards, mice, microphones, and sensors convert physical actions into digital signals.
• Output: Monitors, speakers, and printers convert digital data into perceivable forms.

Example

Typing on a keyboard generates scan codes that the OS translates into characters. The CPU processes the input and updates the screen through the graphics card.

Why it matters

Understanding I/O helps troubleshoot hardware issues and design accessible interfaces. Latency in input devices affects gaming and real-time applications.