Logical Volume Manager (Linux) - Wikipedia
In Linux, Logical Volume Manager (LVM) is a device mapper framework that provides logical volume management for the Linux kernel. Most modern Linux distributions are LVM-aware to the point of being able to have their root file systems on a logical volume.
LVM - Debian Wiki
When formatting a LVM volume, you can choose between encrypted LVM or not encrypted LVM. Encrypted LVM is very strong, so if somehow you locked yourself out, unless you have backup...
LVM - Gentoo Wiki
LVM (Logical Volume Manager) allows administrators to create meta devices that provide an abstraction layer between a file system and the physical storage that is used underneath. The meta devices (on which file systems are placed) are logical volumes...