Create a bootable Linux USB from macOS Plug the USB drive into your Mac system and open the Terminal app (just search for Terminal in Spotlight).

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.

How to make a bootable USB drive If you're trying to install a new operating system or flash your BIOS, you're going to need a bootable USB drive - here's how to make one.