Is there any difference between Windows Hosting, Unix Hosting and Linux Hosting?

Well, this is meant that web services are running on which type of Operating System.
If hosting services are running on Windows then it is called as Windows Hosting. You should choose Windows hosting if you plan to use ASP (Active Server Pages) as server scripting, or if you plan to use a database like Microsoft Access or Microsoft SQL Server. Windows hosting is also the best choice if you plan to develop your web site using Microsoft Front Page.
If hosting of web services runs on the Unix operating system then, it is called as Unix Hosting. Unix was the first (original) web server operating system, and it is known for being reliable and stable. Often less expensive than Windows.
If hosting of web services that runs on the Linux operating system then it is called as Linux Hosting.