# Tree: What is a tree in the data structure?

The tree(What is a tree in the data structure) is considered a most flexible, versatile, and powerful data structure that is used in representing the data processing in a hierarchical relationship. It is one of the important data structures in the field of computer science.

Within this blog post(What is a tree in the data structure), we are going to explore What is meant by a tree in a data structure. What are the trees in the data structure and their types? What is the use of trees in a data structure? What are the structures in trees?…..

…..Types of trees in the data structure, Binary tree in the data structure.|What is a tree in the data structure|

We can also define a tree as a finite set of one or more data items which is also called a node such that-

- There is a special node called the root of the tree.
- The remaining node is partitioned into n>=0 disjoint subset, each of which is itself a tree, and they are called subtree.

In simpler words, a tree is a non-linear data structure in which items are arranged in a stored sequence. it is used to represent hierarchical relationships existing amongst several data items.

Fig 1 shows a tree with 18 nodes. the root node N1 has three subtrees T1, T2, T3, and the roots of these subtrees are N2, N3, and N4 respectively.

The number of subtrees of a node is called its degree, root N1 has degree 3. A node with a degree of zero is called a leaf node. The leaf nodes are also called terminal nodes.

If x is the root node and its subtrees are T1, T2, T3, and the roots of subtrees are R1, R2, R3 then R1, R2, and R3 are the children of x. In turn, x is called the parent of R1, R2, and R3. Children of the same parent are called siblings.

In Fig1 N1 is the parent of N2, N3, and N4 hence N2, N3, and N4 are siblings. The Degree of a tree is the maximum degree of the node in the tree. The tree in Fig1 has degree 5.

The ancestors of a node are all the nodes along the path from the root to that node. The ancestor of N14 is N5, N2, and N1. The descendants of a node are all the nodes along the path from a node to the terminal node. The descendants of N1 are N2, N5, and N14.

Each node of a tree is assigned a level number as follows – The root node R of the tree is assigned a level number 0, and a node is assigned a level number,…

… which is one more than the level number of its parent(root) of the subtree to which it belongs. The nodes, which are at the same level numbers, are said to be of the same generation.

The height or depth of a tree is the maximum number of nodes in a branch. This turns out to be one more than the largest number of trees.

#### What is meant by the tree in the data structure?

Unlike an array, stack, linked list, and queue, which come in the category of linear data structure, the tree is a non-linear data structure.

A tree can be empty with no nodes and a tree structure containing one node is called a root node which may be with zero, one, and more subtrees.

#### What is the use of trees in the data structure?

As we have known a tree is a non-linear data structure that stores or keeps the data in a hierarchal format. If we manage or organize any data in the form of a tree as a key element in the binary search tree.

Then we can find any key faster than the linked list but it is still slower than the array.

#### What is a tree example?

There are many areas where the database is maintained in the form of a tree data structure. For example in the field of computer science, it is used in operating systems, graphics, database management systems, computer networking, etc.

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**What is a strongly connected graph? / How do you know if a graph is strongly connected…****Graph: Types of the graph in data structure…****AVL Tree In Data Structure…****What is a tree in the data structure…****What is compaction in memory management…****What is garbage collection and how does it work…****Dynamic Memory Management…****Josephus problem & Circular linked list…****What is a circular linked list…****What are the linked lists in the data structure and their types…****What is the priority queue with an example…****the difference between stack and queue…****What is meant by backtracking in the data structure…**

## Conclusion:

A tree is a strong data processing schema of a data structure that is used to store the data item inside it and process it as per requirement. There are a few tree traversing techniques that are used to process the data. The degree of the tree is calculated as the total number of subtrees or nodes attached to that node in a tree.|What is a tree in the data structure|

Inside this blog post(What is a tree in the data structure), we have gone through What is meant by a tree in data structure? What are the trees in the data structure and their types? What is the use of trees in the data structure? What are the structures of trees? Types of trees in the data structure, Binary tree in the data structure.

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