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A computer mouse is a hand-held pointing device that functions as an input device to control the cursor on a computer screen. It allows users to select items, move them, and give instructions by using buttons for actions like "click" or "double-click" and a scroll wheel for navigating through documents and websites. The name comes from its small size and the tail-like cable that resembles the rodent.

Key functions and terms

Input Device: A hardware component that sends data to a computer. The mouse sends data about its location and selection to the computer.

Pointing Device: A tool that allows you to point to objects on a computer's screen.

Cursor: An on-screen pointer that moves in accordance with the physical movement of the mouse.

Buttons: Most mice have at least a left and right button. The left button is used for most selections, while the right button accesses secondary menus. Some mice also include a scroll wheel.

Click: Pressing and releasing the left mouse button to select an item or trigger an action.

Double-click: Pressing the left mouse button twice in quick succession to open a program or file.

Scroll wheel: A wheel, often located between the buttons, that allows you to scroll vertically through documents and web pages.