VMware Fusion is a software hypervisor developed by VMware for macOS. It enables users to install a virtual machine on their Macintosh computer, and to run that virtual machine using VMware's own virtualization tools, or to run the virtual machine using Apple's built-in virtualization tools. VMware Fusion can run as a "host" or "guest" operating system. In a "host" configuration, VMware Fusion can be used to create and run virtual machines on a single Macintosh computer. In a "guest" configuration, VMware Fusion can be used to run a pre-existing virtual machine, or to create a new virtual machine.