A hypervisor or virtual machine monitor (VMM) is computer software, firmware, or hardware, that creates and runs virtual machines. A computer on which a hypervisor runs one or more virtual machines is called a host machine, and each virtual machine is called a guest machine. The hypervisor presents the guest operating systems with a virtual operating platform and manages the execution of the guest operating systems.
Definition of REGRESS. 1. a: an act or the privilege of going or coming back b: reentry 1. 2. : movement backward to a previous and especially worse or more primitive state or condition. 3. : the act of reasoning backward.
Regressive Tax. A tax with a rate that decreases as the taxpayer's income increases. The result of a regressive tax is that the lower-income taxpayer pays a larger percentage of his or her income in taxes than does the higher-income taxpayer. The opposite of the regressive tax is the progressive tax. With progressive taxes, such as the federal Income Tax, the effective tax rates increase as the taxpayer's income increases. The proportionate tax rate, also referred to as a flat tax rate, remains constant as income rises.