The virtualization of physical computers has become the backbone of public and private cloud computing, from desktops to data centers, enabling organizations to optimize hardware utilization, enhance security, support multi-tenancy, and more.
Early virtualization methods were rooted in emulating CPUs, such as the x86 on a PowerPC-based Mac, enabling users to run DOS and Windows. Not only did the CPU need to be emulated, but so did the rest of the hardware environment, including graphics adapters, hard disks, network adapters, memory, and interfaces.
In the late 1990s, VMware introduced a major breakthrough in virtualization, a technology that let the majority of the code execute directly on the CPU without needing to be translated or emulated.
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