Computer input devices are hardware components used to send signals, data, or commands to a computer system. They play a crucial role in how users interact with computers, allowing for data entry, control, and manipulation. The central processing unit (CPU) receives the input from these devices and processes it to produce the desired output.

Key Properties of Input Devices

Variety and Classification

Input devices come in various forms, each serving specific purposes. They can be classified into several categories, including:

• Keyboard Devices: Used for typing and entering commands.

• Pointing Devices: Such as mice and trackballs, for navigating and interacting with graphical user interfaces.

• Composite Devices: Combining multiple functionalities, like game controllers.

• Visual Devices: Including scanners and cameras for capturing images.

• Audio Input Devices: Microphones for recording sound.

Specific Examples and Functions

• Keyboards: The most common input device, resembling a typewriter layout, with keys for alphanumeric characters and various functions.

• Mice: Pointing devices that control the on-screen cursor through movement on a flat surface.

• Joysticks: Used primarily for gaming, allowing multi-directional control.

• Scanners: Convert physical documents into digital images for processing and storage.

• Microphones: Capture and convert sound into digital signals for recording or voice commands.