Windows services are one component which the user hardly need to be aware of. For the novice user, services are simply background operation tasks which takes care of the various system operations. With that approach in mind, Microsoft developed the Service Control Manager (services.msc) which is shipped with the various versions of windows.
Some users, however, require more sophisticated service control management tools. Among these users are system administrators, software developers (with emphases on windows services & kernel drivers software developers) and system builders which require more.