A mouse button is one or more buttons found on the front portion of a computer mouse that allows a computer user to perform an action. For example, a user may be required to click the mouse button to open a file, or hold the mouse button down to highlight text.
Mouse button actions
Today, every mouse has at least two mouse buttons, and may have additional buttons found on the side of the mouse.
Left mouse button
- Default mouse button on most operating systems and programs.
- Used to click, select, or open an object on the computer. For example, you would left-click to open a link in a browser or double left-click (double-click) to open a program on a Microsoft Windows operating system.
- Left-clicking and holding down the button while dragging the mouse highlights text.
- In a game, the left button is used as the action button. For example, in a shooter game, the left button is often used to shoot a gun.
Right mouse button
The right mouse button is used to give additional information, or the properties of a right-clicked item. For example, if you right-click on anything highlighted, you are given a menu that can allow you to copy the highlighted text or another object.
Middle mouse button or wheel button
Many computer mice with wheels can also use the wheel as a button. Pressing down on the mouse wheel acts as a button and its action depends on the software installed with the mouse. By default, the middle button is used to open a link in a browser in a new tab.
For mice with thumb buttons, these buttons can be programmed to perform any action. By default, these buttons are used to move backward or forward in an Internet browser.
There are also some computer mice that have more than the buttons listed above. For example, a gaming mouse can have dozens of different buttons that can be programmed to perform any number of actions in a game.
See our click definition for further examples of the type of clicking that can be done with the mouse buttons.