Root node definition
A root node is the top node in a tree data structure. In computer science, many things are organized in tree structures, and the root node is where it all begins.
Think of it as the trunk of a tree from which all branches emerge. Everything else in that tree comes down from the root.
Here’s a breakdown of the root node:
Tree Data Structure: Trees are hierarchical data structures with a top-down approach with linked nodes. Trees are used in situations where data has inherent hierarchical relationships. For example, folders and files in a file system or nodes in an XML document.
Root Node: This is the topmost node of the tree. A tree has exactly one root node. It serves as the starting point for many operations on the tree, such as traversals or searches.
Child Nodes: Nodes that connect to another node in a downward direction. For example, in a binary tree, a node can have at most two children (a left and right child).
Leaf Node: Nodes that do not have any children.
Parent Node: For every node in the tree other than the root, one other node directly connects to it in an upward direction. This node is called its parent.