What Is Traversal in Data Structure?


Larry Thompson

What Is Traversal in Data Structure?

Data structures are fundamental components in computer science that allow us to organize and manipulate data efficiently. One common operation performed on data structures is traversal, which refers to the process of accessing and visiting each element or node in a data structure.

Traversal plays a crucial role in various algorithms and operations, allowing us to perform tasks such as searching, sorting, and modifying data. In this article, we will explore different traversal techniques and how they can be implemented in different data structures.

Types of Traversal

Traversal can be broadly classified into two main types: depth-first traversal and breadth-first traversal.

Depth-First Traversal

In depth-first traversal, we explore a data structure by going as deep as possible before backtracking. This technique is commonly used for exploring trees and graphs. Depth-first traversal can be further categorized into three subtypes: pre-order, in-order, and post-order traversal.

  • Pre-order: In pre-order traversal, we visit the current node before its children nodes. This is often used when we want to create a copy of the tree or evaluate expressions represented by the tree.
  • In-order: In in-order traversal, we visit the left child node first, then the current node, and finally the right child node.

    This is commonly used for binary search trees (BST) where it produces sorted output.

  • Post-order: In post-order traversal, we visit the children nodes first before visiting the current node. This type of traversal is useful when deleting nodes from a tree since it ensures that all child nodes are deleted before their parent.

Breadth-First Traversal

Unlike depth-first traversal, breadth-first traversal explores a data structure level by level. It starts at the root node and visits the nodes in the order of their distance from the root. This technique is commonly implemented using a queue data structure.

Traversal in Different Data Structures

Traversal can be applied to various data structures, including trees, graphs, arrays, and linked lists. Let’s take a closer look at how traversal is performed in some of these data structures:


In trees, traversal is often used to visit each node and perform operations such as searching for a specific value or printing the tree structure. The choice of traversal technique depends on the specific requirements of the task.


Traversal in graphs involves visiting all vertices or nodes to perform tasks such as finding connected components or detecting cycles. Depth-first search (DFS) and breadth-first search (BFS) are commonly used traversal techniques in graph algorithms.


In arrays, traversal simply involves iterating through each element sequentially. This can be done using loops such as for loops or while loops.

Linked Lists

In linked lists, traversal is performed by following the links from one node to another until reaching the end of the list. This allows us to access or modify individual elements or perform operations on the entire list.


Traversal is an essential concept in data structures that allows us to access and manipulate data efficiently. By understanding different traversal techniques and their applications in different data structures, we can design more effective algorithms and solve complex problems with ease.

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