# Revisions & Versioning
Revisions are created when an original Item is updated. These alternate versions are tracked so that previous states can be recovered, or potential edits can be staged.
Every change made to items in Directus is stored as a complete versioned snapshot. The Revisions system is tightly coupled to the Activity Logs system, with each revision being linked to the specific Activity event which created it.
# Revision Fields
- Data — A full snapshot of the item after the event
- Delta — The specific field data changed by this event
- Parent — If this revision was created via a nested relationship