A range of virtualization software; VMware Fusion is the name of the product for macOS. For questions about VMware products unrelated to macOS, please consider Super User.

VMware Fusion is a virtual machine software product developed by VMware for Macintosh computers with Intel processors. Fusion allows Intel-based Macs to run x86 and x86-64 "guest" operating systems, such as Microsoft Windows, Linux, NetWare and Solaris as virtual machines simultaneously with Mac OS X as the "host" operating system using a combination of paravirtualization, emulation and dynamic recompilation.

(source: Wikipedia)

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