A mouse is a pointing device used to interact with a PC, there are a few different types of mouse available.
Serial Mouse - This is a mouse with a serial connector, it requires a free serial port on your PC.
USB Mouse - This type of mouse has a USB connector and requires a free USB port.
Cordless Mouse - A cordless mouse (as the name suggests) has no cable, this type of mouse utilises batteries for its power supply.
Optical Mouse - An optical mouse utilises optical electronics to track the mouse's position and movement, they are preferred over standard mechanical mice as they tend to be more reliable and require less maintenance.
Whichever type of mouse you buy ensure it is compatible with your PC, and that you have the free port available.
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