text: what are the function of the mouse?   the function of a mouse on a computer is to ease the task of moving the cursor around on-screen in a graphical environment; it also allows for the selection and activation of various functions that are presented on-screen.  a computer mouse may also have various other functions, such as scrolling up and down or side to side in a window that is larger than the screen (with a wheel that may be built-in), selecting items for copying into the computer's memory, etc.