# What Are the Different Types of Tree in Data Structure?

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Angela Bailey

When it comes to data structures, trees are an essential concept to understand. A tree is a hierarchical data structure that consists of nodes connected by edges.

Each node in a tree can have zero or more child nodes, except for the root node, which has no parent. In this article, we will explore the different types of trees in data structure and their characteristics.

## 1. Binary Tree

A binary tree is a type of tree where each node has at most two children, referred to as the left child and the right child.

The left child comes before the right child. Binary trees can be classified further based on their shape:

### 1.1 Full Binary Tree

A full binary tree is a binary tree in which every node other than the leaves has two children. In other words, every level of the tree is completely filled except possibly for the last level.

### 1.2 Complete Binary Tree

A complete binary tree is a binary tree in which all levels are completely filled except possibly for the last level, which is filled from left to right.3 Perfect Binary Tree

A perfect binary tree is a binary tree in which all levels are completely filled with maximum possible nodes.

## 2. AVL Tree

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

It maintains a balance factor for each node, ensuring that the heights of its left and right subtrees differ by at most one. If an insertion or deletion violates this property, rotations are performed to rebalance the tree.

## 3. Red-Black Tree

A red-black tree is another type of self-balancing binary search tree. It ensures that the tree remains balanced by enforcing five properties: every node is either red or black, the root is black, every leaf (null node) is black, if a node is red, both its children are black, and all paths from any node to its descendant leaves contain an equal number of black nodes.

## 4. 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 file systems and databases to store large amounts of data efficiently. B-trees maintain a balance by adjusting the tree structure and redistributing keys when nodes become full or underfilled.

## 5. Trie

A trie (prefix tree) is a specialized type of tree used for efficient retrieval of keys associated with values, such as in dictionaries or autocomplete systems. Each node represents a common prefix of strings, and the edges represent individual characters.

## Conclusion

Trees are versatile data structures with various types that serve different purposes. Understanding these different types of trees can help you choose the appropriate structure for your specific application or problem. Whether it’s binary trees, AVL trees, red-black trees, B-trees, or tries, each type has its own unique characteristics and advantages.

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