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Dequeue is a fundamental operation in data structures, specifically in the context of queues. It refers to the process of removing an element from the front of the queue. A queue follows the First-In-First-Out (FIFO) principle, meaning the first element added to the queue will be the first one to be removed when a dequeue operation is performed. Dequeuing is essential for managing tasks in various applications, such as scheduling processes in operating systems, handling requests in servers, and processing data streams.