I'm wondering in terms of execution proiority among other threads/tasks.

What is the deference between: https://developer.apple.com/documentation/swift/taskpriority/background and https://developer.apple.com/documentation/dispatch/dispatchqos/qosclass/background

And one more specific question: Does TaskPriority is executed while app is running in background like in QoS:

Background tasks have the lowest priority of all tasks. Assign this class to tasks or dispatch queues that you use to perform work while your app is running in the background.

Thank you!