Using a parent VM, linked clones use a snapshot based delta disk to create a clone VM.

Linked clones save disk space as they share the same common base files with their parent VM.

However, linked clones are limited to a chain disk length of 30, still consume a large amount of RAM and are slow to deploy which is why I recommend using instant clones which are better in almost every way.

To deploy a linked clone, create a template VM and shut it down.