Which queue class implements a global access or global queue?

In iOS, the global queue is implemented using the DispatchQueue class with the method global().

A global queue is a system-managed queue available throughout the app. It is used for executing background tasks with different priority levels.

Example of using a global queue:

DispatchQueue.global(qos: .background).async {
    // Code executed in the background
    print("Running on global queue")
}

Here, DispatchQueue.global() returns a global queue with the specified quality of service (QoS).