What Is Tree and Different Types of Tree in Data Structure?


Scott Campbell

What Is Tree and Different Types of Tree in Data Structure?

In data structure, a tree is a widely used abstract data type that represents a hierarchical structure. It consists of nodes connected by edges, where each node can have zero or more child nodes.

Types of Trees

1. Binary Tree:

A binary tree is a type of tree where each node can have at most two children, referred to as the left child and the right child. The left child is always less than the parent node, while the right child is greater.

Binary trees are extensively used in various applications like binary search trees and binary expression trees.

2. AVL Tree:

An AVL (Adelson-Velsky-Landis) tree is a self-balancing binary search tree.

It ensures that the difference in height between the left and right subtrees of any node is at most one. If this balance property is violated during insertion or deletion, rotations are performed to restore it.

AVL trees provide efficient searching, insertion, and deletion operations with a worst-case time complexity of O(log n).

3. B-Tree:

A B-tree is a self-balancing search tree that can have more than two children per node. It is commonly used in databases and file systems due to its ability to efficiently handle large amounts of data.

B-trees provide faster access times compared to binary trees by reducing disk I/O operations through their balanced structure.

4. Red-Black Tree:

A red-black tree is another type of self-balancing binary search tree.

It maintains balance by coloring each node either red or black based on specific rules. These rules ensure that no path from the root to a leaf is significantly longer than any other path.

Red-black trees are commonly used in computer science algorithms and data structures due to their guaranteed worst-case time complexity for insertion, deletion, and search operations (O(log n)).

5. Trie:

A trie (prefix tree) is a specialized tree structure used for efficient retrieval of keys associated with values. It is primarily used for string-related operations like autocomplete, spell checkers, and IP routing tables.

Tries provide fast lookup times based on the length of the search key, making them suitable for applications where string matching is crucial.


Trees play a fundamental role in data structures and are essential for organizing data in a hierarchical manner. Understanding the different types of trees allows developers to choose the most appropriate structure for their specific application needs.

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Happy coding!

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