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The mouse is a computer input device used to move a cursor around a screen. The mouse buttons are used to interact with whatever is being
Computer mice come in many shapes and sizes but are all designed to fit either the left or right hand, and be used on a flat surface.
The standard mouse has two buttons toward the front (to left-click and right-click) and a scroll wheel in the center (to quickly move the screen up and down). However, a computer mouse can have anywhere from one to several more buttons to provide a wide variety of other functions (like the 12-button Razer Naga Chroma MMO Gaming Mouse).
While older mice use a small ball on the bottom to control the cursor, newer ones use a laser. Some computer mice instead have a large ball on top of the mouse so that instead of moving the mouse across a surface to interact with the computer, the user keeps the mouse stationary and instead moves the ball with a finger. The Logitech M570 is one example of this type of mouse.
There are also mice made for special uses, such as travel mice which are smaller than a typical mouse and often have a retractable cord. Another type is the ergonomic mouse that has a very different shape than a standard mouse to help prevent hand strain.
As you can see, mice come in all sorts of shapes, sizes, and colors.