Bootable USB
A Bootable USB is a USB drive that has a mini operating system on it. Just enough of one to allow you to boot.
Creating
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Download an iso to ISO-PATH. An iso is the raw 1s and 0s of the entire operating system: you can find it by searching the internet for "\<distro> download".
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Flash the iso to a USB drive. NOTE: etcher is easier than the below methods, but it sends tracking requests to various sites including google-analytics (source).
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If on Windows use a program called "rufus"
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If on Mac or Linux
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Open Terminal as administrator
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Find the drive path of the drive you wish to write (
sudo fdisk -l
can help with this) -
MAKE SURE YOU HAVE THE CORRECT DRIVE
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MAKE SURE YOU HAVE THE CORRECT DRIVE AGAIN
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Execute
sudo dd if=ISO-PATH of=DRIVE-PATH status=progress
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Terminology Notes:
Installation Media
A way to install another operating system, sometimes a Live USB.
Live USB
A bootable operating system that you can preform normal tasks in. This does not store the files you create, much like a guest session. Can be used for recovery and trying out distros.