This command is used for taking snapshots of a virtual machine and for manipulating and discarding snapshots.

The take operation takes a snapshot of a virtual machine. You must supply a name for the snapshot and can optionally supply a description.

The discard operation discards a snapshot specified by name or by identifier (UUID).

The discardcurrent operation will either revert the current state to the most recent snapshot (if you specify the -state option) or discard the last snapshot and revert to the last but one (with the -all option).