Are you curious about what a personal computer operating system is? Do you wish to learn how it works so you can better understand your computer? Then you have to keep reading because you will find out this information now. First, an operating system is software that controls the way that the computer operates. It directs the date input and date output, keeps tracks of all the files on the computer and it also controls the processing for the programs on the computer. Every computer these days that you purchase at any store will already have an operating system installed.