The Design of a Basic PC Mouse
Your PC’s mouse finds its home to the right or left of the keyboard (depending on your dominant hand). The mouse needs a clear swath of desk space so that you can move it around. A typical computer mouse is shown in this figure, although what you see there is only one style of mouse. The variety is truly endless. Even so, nearly all computer mice have the same basic parts:
Left (main) button: The left button, which falls under your right hand’s index finger, is the main button. That's the button you click the most.
Wheel button: The center, or wheel, button can be pressed like the left and right buttons, and it can be rolled back and forth. Some wheels can even be tilted from side to side.
Right button: The right button is used for special operations, although right clicking mostly pops up a shortcut or context menu.
Mouse body: The mouse is about the size of a bar of soap. You rest your palm on its body and use your fingers to manipulate the mouse buttons.
Special buttons: Some mice come with special buttons, which can be used for Internet navigation or assigned specific functions by using special software.