Operating Software
Operating software is software used to manage programs in a computer. An operating system is software that, after being initially loaded onto a computer by a boot program, manages all the other processes in a computer. The processes, known as applications, make requests for services through an application program interface. Users can interact directly with an OS through a user interface such as graphical user interface (GUI).
Utility Software
Utility software is software that has been designed to analyze, optimize, maintain or configure computers. Utility software is software that has been designed to help analyze, optimize, maintain, or configure a computer. Utility software focuses on how the computer infrastructure operates. Examples of utility software are antiviruses and repair tools.