Web Reference: Dec 11, 2025 · Queue is a linear data structure that stores items in a First In First Out (FIFO) manner. The item that is added first will be removed first. Queues are widely used in real-life scenarios, like ticket booking, or CPU task scheduling, where first-come, first-served rule is followed. 1 day ago · In a FIFO queue, the first tasks added are the first retrieved. In a LIFO queue, the most recently added entry is the first retrieved (operating like a stack). With a priority queue, the entries are kept sorted (using the heapq module) and the lowest valued entry is retrieved first. Queues can be implemented by using arrays or linked lists. Queues can be used to implement job scheduling for an office printer, order processing for e-tickets, or to create algorithms for breadth-first search in graphs.
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