I know the operating systems listed following：Windows、Linux、DOS 、Mac OS、UNIX、Android、symbian、IOS、BlackBerry OS.  And I have used Windows、Linux（computer），iOS（ipad），Android（phone）.

 

• Windows        Windows is a multi-tasking operating system he uses a graphical window interface the user of the computer’s various complex operations can be achieved by clicking the mouse. This operating system can run on several different