“Essentially, it’s the entire operating system stored on a USB drive. Very cool.”
And very old. Linux has been able to do this for a long time — off a USB, off a CD, off a DVD, off a spare partition, off a virtual desktop, etc.
It is good news, though. You’ll be able to have a Windows USB so you don’t have to have it taking up space on your drive — I like that.
off a USB