The hierarchical arrangement of the data is considered as the tree structure.
Unlike Array and Linked List, which are linear data structures, tree is hierarchical (or non-linear) data structure.
Tree is the Non-linear data structure.
Implementation of the tree is possible by both array and Linked list
But linked list is more popular and useful method.
Path: path refers to the sequence of nodes along the edges of a tree.
Root: The node at the top of the tree is called root.
Parent: Any node except the root node has one edge upward to a node called parent.
Child: The node below a given connected by its edge downward is called node.
Leaf: The node which does not have any child node is called the leaf node.
Types of tree:
Binary Search Tree
Complete Binary Tree
Full Binary Tree
Application of Tree :
For representing a city region telephone network.
To represent an image in the form of a bitmap.
To implement the undo function in a text editor.
Your file system is a tree structure.