Term: MacOS, Description: Operating system for Apple computers, Question: Are there multiple versions of system software for MacOS?, Answer:Yes
Fact1: Classic Mac OS System Software refers to the series of operating systems developed for the Macintosh family of personal computers by Apple Inc. from 1984 to 2001. Fact2: MacOS is a series of proprietary graphical operating systems developed and marketed by Apple Inc. since 2001. 