The mouse is a pointing and clicking device. The pointing is simply the x and y location plotted on the screen or display. When you move up down and side to side the x and y location changes along with your cursor on creen. Item on the screen have functions built into them waiting for the mouse to interact with them. A click down on the button will start this process. Some web pages have javascript embedded on them to watch(listen) for the mouse to move and click. The middle wheel of most of todays computer mouse is designed to scroll and or zoom.
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The Mouse operation(function) is to help us control the computer better and make it easy for us to access computer programs, documents, etc.
The four basic operations of a mouse include clicking, double-clicking, dragging, and pointing. A mouse can also be used for scrolling through documents or websites.