Unique identifier for a partition. Concept exists in both ext and NTFS.
Given when you create of format a partition.
Can be found with tools such as lsblk -o, blkid, or gparted.
Get UUID of a device:
sudo lsblk -no UUID /dev/sda1
Get all devices:
sudo lsblk -no UUID /dev/sda1
An ext partitions concept.
Determines the mount name for the partition.
Should be unique, but not sure this is enforced. TODO