Each VM eats up some CPU time, RAM, and other resources. You can also run multiple VMs at the same time, but you’ll find yourself somewhat limited by your system resources. As you can see, we’ve got full VMs with several versions of Windows and Ubuntu installed. Here’s a peek at some of the VMs we use when testing things out while writing articles. The limit to how many VMs you can have are really just limited by the amount of hard drive space. RELATED: 4+ Ways to Run Windows Software on Linux Demanding games or other apps that require serious graphics and CPU power don’t really do so well, so virtual machines aren’t the ideal way to play Windows PC games on Linux or Mac OS X-at least, not unless those games are much older or aren’t graphically demanding. Virtualization does add some overhead, so don’t expect them to be as fast as if you had installed the operating system on real hardware. This means you won’t have to mess around with partitioning or doing anything else complicated with your real hard drive. The VM app presents this file the guest OS as a real hard drive. In a particular VM, the guest OS is stored on a virtual hard drive-a big, multi-gigabyte file stored on your real hard drive.

It helps keep things from getting too confusing. In the VM world, the operating system actually running on your computer is called the host and any operating systems running inside VMs are called guests.

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