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A circular queue is a linear data structure that connects the last position back to the first position, allowing for efficient use of space by reusing empty slots as elements are dequeued. In contrast, a double-ended queue (deque) allows insertion and deletion of elements from both ends—front and rear—providing more flexibility in how elements are managed. While a circular queue has a fixed size and operates in a FIFO (First In, First Out) manner, a deque can grow in both directions and supports both FIFO and LIFO (Last In, First Out) operations.

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