qemu is a virtual computer, which allows you to run software (even a different operating system) in a window from your own os.
for example, if you are not using gnu[lit]/[lit]linux, it will allow you to try it in a window.
qemu can load a second operating system from a virtual hard drive (a file on your computer which it uses as a drive) or an .iso file.
gnu[lit]/[lit]linux users will want to use qemu with the -enable-kvm option, otherwise qemu will be slow.
windows users will want to the -enable-hax option, otherwise qemu will be slow.
either of these options may require virtualisation to be enabled in the bios settings.
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