A virtual machine (VM) is a software-based emulation of a physical computer system that runs on a host machine. It allows multiple operating systems to run on a single physical machine, enabling users to run different applications and software that may not be compatible with their primary operating system.
VMs are commonly used for software development, testing, and deployment, as they provide a way to isolate applications and services from the underlying hardware. They can also be used for running legacy software, sandboxing potentially malicious programs, and creating scalable and flexible infrastructure in cloud computing environments.
Some popular virtual machine software includes VMware, VirtualBox, and Microsoft Hyper-V. VMs can be created, managed, and configured through a hypervisor, which is a type of software that allows multiple VMs to run on a single physical machine.