how many operating systems are there for computers
Windows is the most popular among them because it is one of the best os and it is already used in lots of computers. And, large amount of softwares are made for windows. Jean-Clod. Well, for Desktops/Servers, there are 4 main types of operating systems: Windows, and the three UNIX-based ones: Linux, MacOS, BSD. most OS' are based on those. I know, there are ones that aren't forks of those, but these aren't really used anymore. But I am no expert.