Queue is

Correct option is D

A Queue is a linear data structure in which elements are arranged sequentially and processed in a specific order — First In, First Out (FIFO). This means the element inserted first is the first one to be removed. Common real-world examples include queues at ticket counters or printers.

Important Key Points:

1. A queue follows the FIFO (First In, First Out) principle.
2. Basic queue operations include enqueue (insertion) and dequeue (deletion).
3. Queues are implemented using arrays or linked lists in programming.

Knowledge Booster:

• Both Linear and Non-Linear data structure: Incorrect, as a queue maintains a strict sequential order and does not branch like trees or graphs.
• Structural data structure: This term is not a standard classification in data structures; data structures are generally classified as linear or non-linear.
• Non-linear data structure: Used for data structures like trees and graphs, where data elements are not arranged sequentially.