VMware Player is a free desktop virtualization software application that can be used to run multiple operating systems on the same computer. It is a type of hypervisor that allows users to create and run virtual machines (VMs) on a single physical machine. VMware Player can be used to run multiple operating systems, including Windows, Linux, and Mac OS X, on the same computer without needing to partition the hard drive or reboot the system. It also supports the ability to drag and drop files between the host and guest operating systems.