Managed integrations are essentially webhook integrations pushing events to external recievers over https. It support pushing asset events on the below actions
Create
Update
Delete
The reason for the naming managed integration is because the system keeps a state on the assets that is being syncrhonized which means the system can be intelligent on when the asset event is important for the given integration (i.e. if nothing of interest has been updated, disregard the event).
On top of this managed integration allows the integration to provide a custom configuration model (i.e. a Json scheme) that can be populated through the KeyShot management UI.
This type of integration should be used for automatic integration running in the background that does not require user interaction. Typically this type of integration is used to syncrhonize data between two systems. An example of this is Product information management systems (PIM).