What Is BST in Data Structure?


Scott Campbell

A Binary Search Tree (BST) is a fundamental data structure in computer science and is widely used in various algorithms and applications. It is a type of binary tree where each node has at most two children, referred to as the left child and the right child. In a BST, the left child is always less than its parent, and the right child is always greater than its parent.

Properties of a Binary Search Tree

  • Ordered Structure: One of the key properties of a BST is that it maintains an ordered structure. This means that for every node, all elements in its left subtree are less than the node’s value, and all elements in its right subtree are greater.
  • Efficient Searching: The ordered structure of a BST allows for efficient searching. When searching for a specific value in a BST, we can compare it with the current node’s value and traverse either to the left or right subtree based on the comparison result.

    This approach significantly reduces the search space.

  • Insertion and Deletion: Insertion and deletion operations in a BST are also efficient due to its ordered structure. When inserting a new element, we compare it with each node’s value until we find an appropriate position to insert it. Similarly, when deleting an element, we rearrange the tree while maintaining its ordered property.

Example of a Binary Search Tree

To better understand how a BST works, let’s consider an example:

        /   \
       3     10
      / \      \
     1   6      14
        / \     /
       4   7   13

In this example, we have a BST with several nodes. Each node follows the ordering property, where all elements in the left subtree are less than the node’s value, and all elements in the right subtree are greater. For instance, the left subtree of node 8 contains nodes 3, 1, 6, 4, and 7.

Applications of Binary Search Trees

Binary Search Trees find applications in various domains:

  • Searching: As mentioned earlier, BSTs excel at searching due to their ordered structure. They are commonly used in search algorithms like binary search to efficiently locate elements in a sorted collection.
  • Sorting: BSTs can also be utilized for sorting elements.

    By performing an in-order traversal of the tree, we can retrieve the elements in sorted order.

  • Range Queries: With a BST’s ordered structure, range queries become simpler. We can easily find all values within a specific range by traversing the tree accordingly.


A Binary Search Tree is a versatile data structure that offers efficient searching, insertion, and deletion operations. Its ordered structure makes it suitable for a wide range of applications such as searching, sorting, and range queries. Understanding how BSTs work is crucial for any developer or computer science enthusiast.

So remember to keep these points in mind when working with BSTs and explore their numerous applications!

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