At what stage of execution does the initialization and startup of services occur in the system?

In Android, initialization and starting of services usually occur at runtime, when an application component (such as an Activity or BroadcastReceiver) calls the startService() or bindService() method.

The system creates an instance of the service and calls its lifecycle methods, starting with onCreate(), followed by onStartCommand() for starting.

Thus, services are started dynamically during the application's operation, not at system startup, which helps save resources and start services as needed.