System accounts (account)
System resources are tied to accounts, used to define access rights to use or control the resources.
Each user has a single, personal account.
Non-personal accounts can be created for roles or groups. Use a role for resources handed over (not put on hold) e.g. during a vacation. Use a project when multiple persons (now or later) should have equal access.
A special account "root" with full access to all system resources is used only for administration purposes.