I will describe Boot Camp below, but in this article I will focus on a second, and in my opinion better, way to run Windows on a Mac, and that is by creating a virtual machine using a third-party Mac application called VM Fusion. You can 'Boot Camp' your machine, and choose at startup which operating system-OS X or Windows-you wish to run. It is possible to run both OS X and Windows on the same Mac. You could keep your old Windows machine and crowd your desk with two CPUs and keyboards, or two laptops.
Or maybe you simply want to spend some time perfecting your Mac skills before you start using it for your job. You enjoy the OS X experience using VoiceOver, but you still need to use Windows because a critical piece of software does not run on Mac.