This is perhaps one of the most difficult questions to be answered with a plain simple answer. Before we decide on the most compatible operating system for web hosting we need to delve a little further to know what an operating system is and why is it being given so much importance. What is an Operating System?The applications that you can use on your computer, the internet chatting and browsing dealings are all possible due to the help of the operating system. Operating systems are the backbone of computers that help you in completing your task with ease. Most of the computers use the Windows operating system such as ME, XP, NT and several others.