In a standard queue (FIFO - First In, First Out), you cannot enqueue and dequeue at exactly the same time because these operations are performed sequentially. However, in certain implementations, such as multi-threaded environments or circular queues, you can achieve simultaneous enqueue and dequeue under specific conditions:

Single-threaded Queue: Operations happen sequentially. You either enqueue (add an element) or dequeue (remove an element), but not both at the exact same moment.

Multi-threaded Queue (Concurrent Queue): In multi-threaded programming, concurrent data structures like Java’s ConcurrentLinkedQueue or Python’s queue.Queue allow multiple threads to enqueue and dequeue simultaneously without conflicts. These queues use locking mechanisms or lock-free algorithms to ensure thread safety.

Circular Queue: A circular queue can support simultaneous enqueue and dequeue if there is at least one empty space between the front and rear pointers. This is useful in real-time systems like buffering data streams.