Which of the Mac OS, Windows Explorer, Red Hat or Solaris is not an Operating System?

Windows Explorer is not an operating system. Explorer is the technical name for the file folder icon that you click to bring up a list of all the documents on your computer, and every operating system has its own version of this application. You can search for specific documents here, or just browse through whatever folder it brought up. The named folders on a desktop are also quick links to specific areas in the Explorer application.

However, to the uninitiated, Red Hat can look like it’s not an operating system. They have released an operating system named Red Hat Linux, which works on any machine that can operate Linux. Solaris has released a Unix operating system, which works as long as a machine can read Unix.