What is different between Hyper-v and VMware?

Microsoft Hyper-V and VMware ESX are hypervisor-based solutions. They install directly on the hardware and require no lower level OS beneath them, however, their architecture is quite different. It acts as the intermediary between the hardware and any virtual machines running on the server.

VMware is a virtualization and cloud computing software provider based in Palo Alto, California. Founded in 1998, VMware is a subsidiary of Dell Technologies. VMware bases its virtualization technologies on its bare-metal hypervisor ESX/ESXi in the x86 architecture.
Windows & VMware
VMware ESXi (formerly ESX) is an enterprise-class, type-1 hypervisor developed by VMware for deploying and serving virtual computers. ESXi replaces Service Console (a rudimentary operating system) with a more closely integrated OS. 

Key: ESX/ESXi is the primary component in the VMware Infrastructure software suite.

Microsoft Hyper-V, codenamed Viridian and formerly known as Windows Server Virtualization, is a native hypervisor. it can create virtual machines on x86-64 systems running Windows.

Hypervisor technology is software on which multiple virtual machines can run, with the hypervisor layer controlling the hardware and allocating resources to each VM operating system. 

Key: Hyper-V is the virtualization platform that is included in Windows Server 2008.

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