A bi-directional list is an example of a non-linear data structure.

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A bi-directional list, also known as a doubly linked list, is a non-linear data structure because it allows for each node to be connected to two other nodes in the list, creating a "backward" as well as "forward" direction. Non-linear data structures do not follow a sequential or linear progression like arrays, but rather have nodes that can be connected in various directions.

A Bi-Directional List Is an Example of a Non-Linear Data