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Virtualization
In computing, virtualization (abbreviated v12n) is a series of technologies that allows dividing of physical computing resources into a series of virtual machines, operating systems, processes or containers.[1] Virtualization began in the 1960s with IBM CP/CMS.[1] The control program CP provided each user with a simulated stand-alone System/360 computer.
In hardware virtualization, the host machine is the machine that is used by the virtualization and the guest machine is the virtual machine. The words host and guest are used to distinguish the software that runs on the physical machine from the software that runs on the virtual machine. The software or firmware that creates a virtual machine on the host hardware is called a hypervisor or virtual machine monitor.[2] Hardware virtualization is not the same as hardware emulation. Hardware-assisted virtualization facilitates building a virtual machine monitor and allows guest OSes to be run in isolation.
Desktop virtualization is the concept of separating the logical desktop from the physical machine.
Operating-system-level virtualization, also known as containerization, refers to an operating system feature in which the kernel allows the existence of multiple isolated user-space instances.
The usual goal of virtualization is to centralize administrative tasks while improving scalability and overall hardware-resource utilization.
Plymouth (/ˈplɪməθ/ ⓘ PLI-məth) is a port city and unitary authority in Devon, South West England. It is located on Devon's south coast between the rivers Plym and Tamar, about 36 miles (58 km) southwest of Exeter and 193 miles (311 km) southwest of London. It is the most populous city south of London.
Plymouth's history extends back to the Bronze Age, evolving from a trading post at Mount Batten into the thriving market town of Sutton, which was formally re-named as Plymouth in 1439 when it was made a borough. The settlement has played a significant role in English history, notably in 1588 when an English fleet based here defeated the Spanish Armada, and in 1620 as the departure point for the Pilgrim Fathers to the New World. During the English Civil War, the town was held by the Parliamentarians and was besieged between 1642 and 1646. In 1690 a dockyard was established on the River Tamar for the Royal Navy and Plymouth grew as a commercial shipping port throughout the Industrial Revolution.
After absorbing nearby settlements in 1914, the borough was awarded city status in 1928. During World War II, Plymouth suffered extensive damage in the Plymouth Blitz, leading to post-war rebuilding that significantly shaped its modern appearance. A further expansion of its boundaries in 1967 contributed to its current status as the 30th-most populous built-up area in the UK and the second-largest city in the South West after Bristol, with a population in 2021 of 264,727.
Plymouth's economy, historically rooted in shipbuilding and seafaring, has transitioned towards a service-based economy since the 1990s. It maintains strong maritime connections, hosting HMNB Devonport, the largest operational naval base in Western Europe, and offering ferry links to Brittany and Spain. The city is also home to the University of Plymouth, reflecting its educational and cultural significance. Today, the city is governed locally by Plymouth City Council and is represented nationally by two Members of Parliament.
