Early versions of the Raspberry Pi could only boot from SD cards, but newer ones can boot from any USB device, like an external drive or USB stick. Here's how.

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.

It's possible to boot a Windows 10 computer from a USB drive, as long as you have the right settings on your computer and USB. Here's how to do it.