What is doneRendering system event?

Hi Saddam,

DoneRendering system event indicates that the initial rendering of the root application has completed.

The aura:doneRendering event is deprecated unless your component is running in complete isolation in a standalone app and not included in complex apps, such as Lightning Experience or the Salesforce app, the container app may trigger your event handler multiple times. This behavior makes it difficult to handle each event appropriately.

Thanks