A Mac or Macintosh computer is different from a Windows computer. And this is because is using another software as operating system. So, software designed for Windows computers will not run on a Mac computer.
Mac computers are made by Apple who have a long tradition in this, first Mac computer being released in 1984 year.
This computer are very appreciated for using graphics and multimedia applications. There are favorite instruments to work with for professional designers and photographers. But a lot of home users like this operating system and unique design of this PC.