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Mouse as a Pointing Device
                                                                                        Left button
                 The Mouse is a small, lightweight handheld pointing device used to give                      Right button
                 input to the computer in a GUI environment. It is moved on a steady and   Scroll wheel
                 flat surface, to move the corresponding pointer on the screen. The cursor’s
                 motion is proportional to the relative change in position of the mouse.

                 With the help of a left mouse button you can select and move text, icons,
                 files, and folders on your computer. The right mouse button is used to
                 perform additional menu-based functions. The main advantage of using a mouse as an input device is that it has a
                 simple, easy, and efficient way to navigate on the screen without remembering text based commands.

                 With the help of mouse you can:
                 •  Move the mouse pointer on the screen.
                 •  Select an object either by a single click or a double click to open a document, or execute a program.
                 •  Select or highlight a text or a file, either by single click or a double click.
                 •  Drag means to select and move an icon, file, folder or a picture from one place to another on the screen. In order to
                   drag, put the mouse pointer on the desired icon on the screen, then press the mouse button, and without releasing
                   the button, move the pointer to the destination point and release the button.
                 •  Scroll up or scroll down a document by clicking or by using a mouse wheel.






























                 Types of Mouse
                 There are three types of mouse which are discussed below:

                 1.   Mechanical  Mouse (Ball Mouse):  It contains  a metallic  or a rubber ball  on  the
                    bottom. When the mouse moves, the ball underneath also moves along with it.
                    Then the sensors inside identify the motion and move the corresponding cursor on
                    the screen. These days mechanical mouses have been replaced with optical mouses.



                                         2.    Optical Mouse: The mouse ball is replaced by a small optical sensor on the bottom side to
                                             detect the movement by sensing changes in reflected light. This detected light translates
                                             the movement into cursor movement on the screen. The main advantage of using the
                                             optical mouse is that, it is less sensitive to dust, and the movement is more accurate.





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