# Memento

- [Change Tracking Service](/release-2/memento/change-tracking-service.md)
- [MementoEntity and MementoEntityCollection](/release-2/memento/change-tracking-service/memento-entities.md)
- [Handling change tracking:](/release-2/memento/change-tracking-service/handling-change-tracking.md)
- [Simple model](/release-2/memento/change-tracking-service/handling-change-tracking/simple-model.md)
- [Collections](/release-2/memento/change-tracking-service/handling-change-tracking/collections.md)
- [Complex objects graph](/release-2/memento/change-tracking-service/handling-change-tracking/complex-graph.md)
- [Atomic operations](/release-2/memento/change-tracking-service/atomic-operations.md)
- [Change Tracking Service API](/release-2/memento/change-tracking-service/change-tracking-service-api.md)
- [Property Metadata for the ChangeTrackingService](/release-2/memento/change-tracking-service/memento-metadata.md)
- [Handling collection sync](/release-2/memento/change-tracking-service/handling-collection-sync.md)
- [Property State](/release-2/memento/change-tracking-service/property-state.md)