A mouse is a hand-held pointing device that tracks motion across a surface to move a cursor on screen, with buttons and usually a scroll wheel for selecting and navigating.1
Overview
A mouse is an input peripheral. Modern mice sense movement optically — an LED or laser plus a tiny camera reads the surface and reports how far the device has moved — replacing the old mechanical rolling ball. The position data drives the on-screen cursor, while button clicks and wheel scrolls send their own events to the operating system.
Variants trade off precision, ergonomics, and space. Connection is over USB or Bluetooth, and a wireless mouse adds a battery and a receiver dongle or a direct radio link.
Types
The pointing job can be done several ways:
| Type | How it senses | Notes |
|---|---|---|
| Optical mouse | LED + camera on surface | Standard, cheap |
| Laser mouse | Laser + camera | Works on more surfaces |
| Trackball | You spin a fixed ball | Stays in one spot |
| Trackpad | Finger on a touch surface | Built into laptops |
| Gaming mouse | High-precision sensor, extra buttons | Tunable sensitivity |
Where it fits
The mouse and the keyboard are the standard input pair for any desktop computer; a touchscreen replaces both on phones and tablets. Choice comes down to grip, sensitivity, and whether you want extra buttons. For panning a wide spectrum waterfall or zooming into a GopherTrunk plot, a smooth scroll wheel and steady tracking are the features that actually matter.
Sources
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Computer mouse — Wikipedia, on the mouse as a pointing input device. ↩