Perhaps they referenced this guide to create a bootable Live USB on Windows, allowing them to test drive something like Ubuntu without making any changes to their PC.

Conclusion Creating a bootable USB drive on Linux is an uncomplicated task with the right tool at your disposal. The tools listed above cater to a broad range of user expertise levels, making the ...

1) Make sure your PC can boot from a flash drive. You can do this in the hardware settings (also called the CMOS or BIOS settings), but I can’t tell you exactly how.