A volume group is a storage management concept used in computer systems, particularly in Logical Volume Management (LVM). It allows multiple physical storage devices, like hard drives or SSDs, to be combined into a single logical unit. This makes it easier to manage storage space, as users can allocate and resize storage as needed without worrying about the underlying physical devices. Within a volume group, users can create logical volumes, which act like partitions. These logical volumes can be formatted with a file system and used to store data. This flexibility helps optimize storage usage and simplifies data management across different applications and services.