diff between GCD and Queue in depth

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GCD is a low-level API for managing concurrent operations, while Queue is a high-level API for managing tasks in a FIFO order.

GCD stands for Grand Central Dispatch and is a low-level API for managing concurrent operations in iOS and macOS.
Queues are a high-level API in GCD used for managing tasks in a FIFO (First In, First Out) order.
GCD allows you to create and manage queues, while queues are used to execute tasks concurrently or serially.
GCD provides a way to manage threads and execute tasks in a more efficient manner, while queues provide a way to organize and prioritize tasks.
Example: GCD can be used to create a custom queue and specify whether tasks should be executed concurrently or serially, while queues can be used to schedule tasks to run on a specific queue.

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