Logical Volume Management, or LVM, is a format pretty much exclusive to Linux. It is an alternative to partitions which makes space management much easier. Logical volumes can be resized at will, and can span multiple disks. They can be migrated to different disks without interrupting services (live migration). There are also striping and mirroring features that are similar to RAID 0 and RAID 1.
LVM is more complex than basic partitioning, and not commonly used except in large storage installations.
Technically, L VM is a structure that overlays the physical disk partitioning.
