A virtual machine (VM) is a software-based emulation of a physical computer, running an operating system and applications as if it were a separate, dedicated physical machine. Virtual machines are created using a hypervisor, a software layer that enables the creation and management of multiple virtual machines on a single physical machine.
The hypervisor creates a virtualised environment on the host computer, allocating virtual resources such as CPU, memory, and storage to each virtual machine. Each virtual machine has its own virtualised hardware components, including virtual CPUs, virtual RAM, and virtual storage devices.
When a user interacts with a virtual machine, the hypervisor translates the user's inputs and requests to the virtualised hardware components of the virtual machine. The virtual machine then processes the user's request as if it were a dedicated physical machine, using the virtualised hardware components to run the operating system and applications.
Virtual machines are commonly used for a variety of purposes, including software development, testing, and deployment, as well as server consolidation and disaster recovery. Virtual machines enable organisations to run multiple operating systems and applications on a single physical machine, reducing the need for dedicated hardware and improving resource utilisation.
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One of the key benefits of virtual machines is the ability to isolate applications and workloads, providing enhanced security and reliability. Each virtual machine operates independently of other virtual machines on the same physical machine, with its own operating system and applications. This isolation enables organisations to test and deploy new applications without risking disruption to existing applications and services.
Another benefit of virtual machines is their portability. Virtual machines can be easily migrated between physical machines and cloud providers, enabling organisations to move workloads between environments with minimal downtime and disruption.
In summary, a virtual machine is a software-based emulation of a physical machine, running an operating system and applications as if it were a separate, dedicated physical machine. Virtual machines are created using a hypervisor, which enables the creation and management of multiple virtual machines on a single physical machine. Virtual machines offer numerous benefits, including resource utilisation, isolation, and portability.
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