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The mouse was invented by Douglas Engelbart in 1964.
The wire of the mouse looks like the tail of real mice.
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The mouse has 2 buttons and one scroll ball.button is known as left and right click for selecting and taking the step . A scroll ball is used for scrolling the page.
Mouse came with PS/2 Port that is used to plug in your computer. Now it is available in USB Port and wireless also.
In the laptop, there is the option of mouse used as a touchpad, it works the same like the mouse.